Chapter 34: See a police car drive into your yard

Note: lemons.

"Auuhh…" Asia wobbled on the spot as she sat on a chair. It seemed as if the girl would fall asleep at any second, but pained cries of a woman caused her to snap awake every time her eyes could droop.

The Peerage had, after gathering up and gawking a bit at the new service staff, used the teleporter circle in the estate's shed to transfer to the Underworld.

The teleporter had deposited the group to a heavily-guarded spot on what appeared to be well-prepared kill-zone but before anyone could take drastic or hasty actions, a group of devils had approached them and welcomed the group into Phenix family's grounds, and offered to escort them to the main manor.

It seemed that Serafall had managed to deliver the news before the group had arrived, since there seemed to be a localized lightning storm above the manor, but since there was no signs of violence, tsunamis on inland, or other signs of Serafall defending herself, it seemed that the pink terror had just dropped the news with her usual subtlety and gone back to doing whatever she'd do when not causing aneurysms for everyone around her.

Momonga had let the crow created by [Lead of Yatagarasu] fly around, ordering it to scout the area in an attempt to see how much the summons he created could deviate from their original 'purpose' and the constraints they provided.

Unfortunately, since Serafall was gone Momonga, under whose care Ravel had been when she got kidnapped, was left to console the woman. Luckily he had managed to bring the rest of his Peerage into the living room where the exchange was taking place, so if the worst came to worst, he'd have some emotional meatshields to throw between him and the grieving woman.

Indeed, while most of the Peerage were occupying couches or seats, Momonga was sitting on a couch beside the woman, trying desperately to offer her tissues or console her, both to not much effect.

"AAAAH!" Lady Phenix's pained cries caused Momonga's soul to flinch. Or rather, the part of his soul that was 'Suzuki Satoru' to flinch. "RAVEL… AAAH!"

"I'm truly sorry, I failed…" Momonga felt that straightforward approach would allow him to front-load the blame, and then twist it so that everything was Serafall's fault.

Fortunately, it looked like he didn't need to do much mental gymnastics to shift the blame.

"I LOST… I LOST HER! TO INCOMPETENT MAOUS! THIRD! THIRD! THIRD MEMBER OF MY FAMILY" Lady Phenix screeched, her sadness turning to rage upon hearing Momonga's words. Fortunately, her rage wasn't seemingly directed at him. "First Beelezbub's system fails Riser, and he dies or gets his soul torn apart! Then Sirzechs fails to rescue my husband despite him being in his reach! And now Serafall, that damnable airhead, decides to honor Sirzechs' orders over saving my daughter who was within her reach!"

"I HATE THEM, I HATE THEM!" Lady Phenix's screech was causing the entire Peerage to cover their ears, with the exception of Momonga who didn't register pain from his organic body to the extent it'd distract him. "THEY BETRAYED ME! MY TRUST! MY FAITH! OUR ALLIANCE!"

"Ah… well, umu…" Momonga wasn't sure what he should comment, but it seemed that Yubelluna came to his aid. Or rather, to his detriment.

"Lady Phenix, please… Please remember, all of this was initiated and orchestrated by the 'Supreme Being'..." Yubelluna seemed nervous over the older woman's mental state, as the normally warm and caring woman's mental state had turned towards more and more unstable, cruel and sadistic as more and more of her family members had been captured or killed.

'Thanks, Yubelluna. I really needed to remind her of my actions… even if she doesn't know I'm the one responsible for them.' Momonga bit his tongue before he could retort something to the violet-haired woman who seemed to slink on her seat after Lady Phenix gave her a glare.

"I hate that orchestrator as well, but he was not the one I placed my faith on to protect my family, nor the one I expected to protect us as his subjects, or the one I expected to assist my family in these trying times." Lady Phenix's words dripped venom. "I hate that Being for instigating this conflict, I hate it for doing what he did to my son's body, I hate it for capturing and torturing my husband… but It was never the one I thought was my ally, who failed me willingly again and again."

'Oh… phew.' Momonga sighed in relief internally as the woman's anger seemed to be mostly directed to the Maous instead of being solely directed to the 'Supreme Being'. 'Hm, maybe I can leverage that a bit... Although probably I should wait until we're private, or my Peerage is going to get suspicious. I'm supposed to be the enemy of the 'supreme being' after all…''

"We should probably think about finding Ravel, before we grieve too much for her." Momonga told the woman while patting her shoulder a bit awkwardly, and then even more awkwardly when she slumped on the table, crying to her hands. "Erm, where are the rest of your children? Are they safe?"

"Yes, I sent them to Tannin's care… he's no sycophant of Sirzechs' and he has a code of honor he won't break even if ordered otherwise." Lady Phenix's voice came out in a hiss that caused most of the occupants of the room to flinch from the venom in it. "But, yes, you're right… Yet, if what Serafall told me is correct, it's likely that Ravel is in the Underworld. We had a theory going on that the creature holding Riser's body had left the Underworld since we weren't able to locate him, even when Sirzechs had performed a ritual to locate him… but maybe he did, and is just biding his time to ambush the 'Supreme One' if it approaches its agent."

Lady Phenix stopped herself with visible effort before she'd devolve into sobs or screeches again, much to the relief of everyone present.

"Well…" Momonga looked for words, but before he could do much, a knocking sound came from a window nearby. He looked out and saw the crowd he had created sit outside, looking like it wanted to come in.

Yuuto opened the window, and the crow flew to sit on Momonga's shoulder.

"Ah, you're back. Did you find anything interesting?" Momonga asked the crow, and it shrugged and then caw'ed something. 'Right, language barriers… ugh… Why did I think otherwise...'

"Ah, I created this one. Don't worry, it won't soil the furniture." Momonga waved at the crow as Lady Phenix turned to look at it, and then her mouth fell open. "Anyway, we should probably look for Ravel. Do you have anyone you could send out to search?"

'I mean, I could try to send the Crow to look for Ravel, but if what Serafall insinuated is correct, I may have to contact the Elder Lich first and ask him if he has Ravel, or if he has allied himself with the Fallen Angels…' Momonga thought and then reached to pull the crow from his shoulder and offer it towards the matriarch of Phenix house as she continued to stare at it. "...Here, if you want to hold it in your hand…"

The woman took the crow, which let a confused caw as it perched itself on all three feet on the woman's forearm, the eagle-sized crow looking comedically dark when contrasted to the soft red dress of the woman and her blonde hair.

"Three-legged crow… Is this… Samjogo?" The woman blinked, before shaking her head. "No, no, I must be mistaken… no. I mean, Yes, we should send out independent search parties to find my Ravel. We can't trust Sirzechs to ensure the safety of my family any longer."

Momonga glanced to the side to see if Rias was taking the conversation the wrong way as it did involve her brother, but it seemed that the girl was a bit preoccupied grasping and unclenching her hand, all the while her eyebrow twitched in annoyance while she stared at it.

'Oh, that…' Momonga blushed at the memory of Rias's 'tree felling' in his bedroom before the group departed to the Underworld. Or rather, how she had stroked the tree to make it fall down, but had managed to get her hair covered in leaves multiple times in the process and forcing her to take a shower, all the while growling so much Momonga could hear it through the sound of falling water. Although, the red face she had sprouted after touching the 'thing' and the sputtering that her voice had turned into had caused Momonga quite a bit of worry for her mental state in addition to the embarrassment of having the girl do the woodsman's work for him.

"Ah, yes, we should send scouts to find Ravel." Momonga snapped back to present. "I'd offer help, but… well… I don't have many options available to me." 'Hm, since Serafall said that she thought I couldn't locate people in the Underworld, I should keep the status quo until I can contact the Elder Lich. Or, I could try searching for her, but delay rescue until I get on top of the situation, that way Lady Phenix would owe me a debt of gratitude… Hm… that's… actually not a bad idea…'

"Listen. Can you find Ravel Phenix for me?" Momonga directed his words to the crow, and it tilted its head after letting a small caw, clearly asking for further orders after giving an affirmation. "Good. In that case, find Ravel Phenix for me, establish visual contact, and then contact me once you've found her. Do not fail me."

'Interesting… It seems that [Lead of Yatagarasu] can find people after all… or is it because the Underworld is actually a dungeon and it was a dungeon-navigating spell in YGGDRASIL? Or because it can't go between levels of reality so it couldn't find Ravel in the Human World, but could in the Underworld? Interesting…'Momonga analyzed the crow's behaviour as it seemed to get its bearings, twisting its head to seemingly random directions, before seemingly locking on to one direction. 'It's likely that it can just pinpoint her location directly, but I don't want for it to instantly point me to a direction because I need to delay the rescue for a bit. Having the crow take a look at Ravel physically should give me some breathing room…'

The crow let another caw, before hopping off the shocked Phenix woman's forearm, swooping towards the window, and flying out after Yuuto managed to open it just in time to prevent the crow from making a dramatic exit by crashing through the glass.

Momonga could have sworn that he heard a disappointed caw in the bird's wake, causing him to shiver on the inside. 'Could it be that it inherited some of my 'Chuuni' powers? No, no, no, it's not power, it's a curse. Stop, me!'

"T-that... " Lady Phenix seemed to find her voice. "Momon… Thank you. Thank you, thankyouthankyouthankyou…"

Momonga felt the woman turn to hug him tightly, cementing that his attempt to rescue Ravel was at least appreciated by the de-facto leader of the Phenix family. "You're welcome, of course. It's the least I could do after letting her be captured…"

"Place no blame on yourself. I'd be foolish to think that you could have prevented someone like Kokabiel from abducting her, much less rescue her by yourself." Lady Phenix seemed to recover a modicum of her sanity and sense of self after 'Momon's declaration. "I'll have to see if I can rally some trustworthy people for support. I'm not certain how much support the Maous would provide if I were to ask them for aid in rescuing Ravel…"

Momonga nodded. "I see… Well, I think my Peerage needs some rest. Today has been exhausting, and I have a feeling tomorrow will be no better, so we should retire for the night while my, umu, crow scouts out for Ravel. Further conversation about the day's events can hold until tomorrow."

He added the latter notion as it looked like quite few of his Peerage members had burning questions.

"True, true…" Lady Phenix seemed like rest wouldn't go amiss for her either and stood up, wobbly from having screamed and cried for nearly an hour straight. "...I'll need to send some messages first, you lead your Peerage to get some rest. There are guest rooms on the fourth floor…"

Momonga briefly considered supporting the woman, but came to a conclusion that it would likely be seen as inappropriate. A maid soon came to support her mistress, and led her away while a butler came to tell the group that their rooms had been prepared.

Momonga sighed in relief. 'I managed to buy myself another day before I have to explain my actions… I'm not sure if I have the luck of devil, or the misfortune of man on my side. Perhaps both.'

Rias seemed to shake from her stupor as the group started to trickle out of the room, making Momonga realize that the two would be sharing a room, if Lady Phenix's previous accommodation arrangements still held even if the mansion had changed.

'Oh… I hope she won't have too many questions… I don't think I can avoid them when we're alone in the same room...' Momonga gulped mentally while offering his hand to Rias in order to guide her. He figured that a bit more regal pose and behaviour would fit the scenery and the situation than the more relaxed one he had used in the Human World.

Rias grasped the hand, and Momonga was surprised that he didn't feel the now-familiar crunch of breaking bones from the grip. 'Oh… I guess squishing 'that' would have helped her train her control over her newfound strength thanks to Queen Piece… Ugh, and for that to be necessary for the growth in her control over her power… This ero world…'

Momonga sighed before a thought struck him. 'Hm, if ero is the solution for most of the problems in this world, does that mean me doing the deed with my Peerage members raises their power? I need to experiment a bit with Yubelluna, if my theory is correct she'd be quite a bit stronger now than previously…'

"I don't like that look you got on your face." Rias noted to 'Momon', wariness clear in her voice as he led her towards their new room, or rather followed a butler who was directing the two.

Momonga didn't hear her as he was far too busy thinking about his already-drafted training regimen for the Peerage, and wondering if he should consider adding 'team bond-building exercise' to it.

Momonga felt as something let a 'boink' sound inside his head, and he peered into his mental self to see that Touch Me-plushie had whacked 'Momonga' over the head with a bat that read 'horny jail' on its side, causing the extremely confused robe-clad skeleton to sit beside Peroroncino-plushie who had turned the horny jail into a hobby corner, complete with a television and a shelf full of of questionable manga.

Momonga realized where the flow of his thoughts had gone, and emotion suppression activated once again with the enthusiasm of a elderly warehouse worker days before retirement.

"Uh, right. I guess you have questions." Momonga sat in a chair in the bedroom after the butler led them to it and left, and Rias looked like she'd pop a lid for a moment before sitting on a chair in front of him.

The fact the girl had locked the door, and applied some sort of spell that caused the lock to melt into the doorframe didn't help Momonga's rising nervousness.

"What… just what is going on." Rias seemed to grumble to her hand for a while before sighing, and her mental state seemed to stabilize. "Just… what the hell? What are those abilities you pulled? How did you create Angels? What… just, what?"

"Well, I'm not sure. I just started to recall all sorts of things." Momonga resorted to his now worn and earmarked 'amnesia' card, and played 'recalling memories' modifer card on top of it. "I don't remember anything from Issei or Riser, but, er, I'm starting to remember all sorts of other things."

"How?"

"I don't know. I just do." Momonga pressed onwards, placing his hope on his already flimsy excuse.

"...What else do you remember, then?" Rias narrowed her eyes. "What have you not shown us?"

"Well, a bunch of abilities like creating and analyzing things, a list of fire related spells, some, uh, odd spells, and a so on." Momonga rattled out, analyzing the impact the words caused on the girl and continuing as he got positive responses.

"I asked, what have you not shown us?" Rias pushed past Momonga's attempt at misdirection. "What are you trying to avoid telling me?"

"Well… There's a bunch of things. Like, um… I think… well... " Momonga only half-feigned the hesitation as he considered opening his disguise a bit, like how he had done with Gasper. 'I could use [Control Amnesia] to lobotomize the memory out of her head if this goes bad…' "There's a thing, but you have to promise you listen to the end and don't freak out first."

"You're the 'Supreme Being', right?" Rias's eyes glazed over.

Momonga froze utterly. 'Oh, ohnononono,'

"I mean, at this point I wouldn't be even surprised if you said something as outrageous as that…" Rias continued, seemingly either ignoring Momonga's reaction or being too absorbed into her own insanity to notice. "Haha, perhaps you're the progenitor of this world too? The great destroyer that roams the parallel worlds and eats them? A galactic emperor in existence fueled by war and insanity?"

"Umu, I'm not sure… Amnesia, right?" Momonga latched onto his trump card of an excuse as if it was a holy icon that could be used to drive away a demon, before he would snap and cast [Control Amnesia] on the girl, ignoring the possibility that she could resist it or Akeno could notice the difference in the girl's actions afterwards. "But, uh, I don't think I'm a world eater or a galactic emperor…"

"Right." Rias seemed to shake out of her stupor. "So, what were you trying to tell me?"

"Well… I told Gasper about this already, but I think I'm actually, erm, undead." Momonga placed Gasper's name as a shield against Rias's presumed first reaction.

"Uh-huh."

"...I thought you'd be more shocked." Momonga was honest for once. "Because of what happened before…"

"Yeah, that. Riser-thing and undead attack. Ehe." Rias giggled a bit. "So, if you're undead, how come you're not a rotting corpse?"

"Well, I figured out I'm undead when Gasper killed me, so I'm not sure I'd be rotting already..."

"Aha. Yes, of course." Rias nodded seriously, although Momonga could practically see the hairline cracks on her sanity getting wider. "Yes, that would explain you're undead if you got killed but didn't die. But why is your body functioning normally? I had the distinct 'pleasure' of finding out that your body was very much alive just a while ago. And I thank you if you never do that on my hair again. Do you even realizehow hard that stuff is to get out of hair?!"

She flexed her arm, causing Momonga to blush a bit as he remembered what it had done just half an hour before, or how his indirect fire had splattered the girl's hair. "Well, I got better. And about, umu, well, I'll try not to stain your hair again?"

"You died but got better." Rias's tone was flat.

"I healed myself." Momonga corrected himself. "So I'm… well, sort of undead? I mean, if I die I turn undead, but if I live I'm not, something like that?"

"Yeah, that makes sense." Rias nodded seriously, the hairline cracks seemingly getting wider. "Of course. So you have boss fight stages. Aha, ahahaha! I didn't think I'd get to use the knowledge I gained from playing role-playing games with Akeno when we were younger!"

"Well, umu, I don't think it'll work like that, but I guess?" Momonga paused to consider her words. 'Wait, am I a raid boss?'

He considered the possibility, and came to a conclusion that he was, most likely, not a raid boss on the account that he didn't have a dungeon, seeing that Nazarick had become lost to him when YGGDRASIL had shut down.

"Well, anyway, I hope you won't hold it against me." Momonga bowed his head a bit, causing Rias's expression to soften.

"Ha, how could I? That's… about the least significant thing you've shown me thus far." Rias seemed amused, and a little sympathetic. "Don't tell me you've been worrying over that? Because the undead attacked, and you have a stage where you're a bit like the undead?"

"Well, I figured that since Yubelluna and Xuelan abandoned their old master upon him turning undead…" Momonga explained, hiding certain key points such as him being the one responsible for the undead in the first place. 'I'll have to wait for this situation to be solved and buried before I open that can of worms…'

Rias visibly resisted the urge to giggle, and instead stood up from her chair, walked to 'Momon' and sat on his lap.

"Silly." Rias poked Momonga's host body's nose. "You're not a horrible, torturing nightmare that Riser was, or the worse version of him that he became when he turned undead. You're a good person, even if I feel like my mind is breaking more and more every second I'm in your presence and every time your mouth is moving."

Momonga hid his troubled thoughts by tying his hands around Rias's waist. "Thanks, dear."

"Pfft." Rias seemed amused by the word. "Right… You know, I can tell that you're not convinced that you're not a monster just because of what you are, even if I tell you otherwise. It's not like you can pick and choose. And just so you know, I don't particularly hate you despite everything, or think that this whole arrangement between me and you is too forced."

Momonga raised his eyebrow at the sudden change of subject.

Rias continued as she could pick up on Momonga's confusion. "I mean, I was smitten with Issei, but… well, you know. I think that if you stop trying to break my mind with your everyday activities and start acting more normally, we could get along really well. I don't know if it's true love or anything like that, but I don't hate you."

"Even though I've already committed adultery towards you?" Momonga raised an important point, or at least one he thought was important.

"Well, female-to-male ratio in the Underworld is already like four to one so it's not like polygamy isn't popular…" Rias blushed. "The two major wars, one with heavens and one civil war, culled the male population who made the vast majority of the soldiers, which when combined with a slow natural birth rate… Ugh! Why am I starting on a history lesson! Just, I'm fine, but seriously if you don't stop seducing ridiculously powerful or out of reach people I'm going to flip."

"Right, I'll ask you first." Momonga noted flatly. 'Yeah, I somehow figured that this would turn ero too…'

Rias seemed pleased with the answer. "Right, uh… we should probably go and sleep. Your crow is searching for Ravel, right?"

"Right." Momonga nodded. "I think it'll take it a while, but I'm certain it can find her."

"Let's just hope she'll be alright." Rias sighed, then adjusted her position a bit on Momonga's lap as it seemed something made her uncomfortable. "Hm?"

Momonga's host body blushed.

"Really? Didn't you just… blow up like seven times?" Rias's tone was flat. "All over my hair, if I recall…"

"Well…"

Rias reached to peck a quick kiss on Momonga's cheek. "Listen, I can, um… help with that, again? W-we should probably get more comfortable with each other anyway, since we're married now and everything, and it's not like you're a bad person like Riser, so..."

Rias's words seemed to turn into a fumble, and Momonga sighed. 'Well, I guess this is a chance to see if my theory on ero-power-ups of this world holds true.'

It seemed that 'Momonga' had escaped the Horny Jail after conspiring with Peroroncino-plushie to ambush Touch Me-plushie while he wasn't looking, and had stuffed the now-tied up white knight-like doll into 'Prude Jail'.

Momonga decided that he didn't want to know more about his mindscape if it had such a place now, so he stood up while lifting the buxom girl on his arms, then put her down on the bed. "How far do you want to go?"

"Eh? Eeeh?" Rias seemed surprised. "You're taking the lead?"

"Well, it'd be impolite to be passive when you've steeled your heart and made your mind…" Momonga noted, wondering how he should go about the experiment. 'Is the physical exercise tied to increase in power? Or the number of 'launches'? Or quantity of deposits? Since Rias is probably weaker than Yubelluna, her increases in strength would be much more visible, which means she's actually a fairly optimal test subject…'

"Ugh, I think someone is talking behind my back." The hairs in the back of Rias's head seemed to stand up, so Momonga distracted her by pushing her down in the bed, channelling the experiences he had gained with Yubelluna into his actions.

'...Aha! I knew it! I gained experience from doing 'it' with Yubelluna!' Momonga realized that his 'skills' in a particular field of study had 'leveled up' after his 'private study session' with the violet-haired woman. 'As expected of Ero-world! But now that I'm aware of its rules, I can leverage them to my advantage…'

"I-is everything alright? I'm suddenly getting a really bad feeling about this?" Rias seemed worried, so Momonga reassured her.

"Don't worry, everything is within my calculations." Momonga's words didn't seem to help Rias's uneasiness, so he instead kissed the girl, tuning down the intensity as it looked like going full no-brakes-on-train on her would probably not be fun for the red-head, at least initially, unlike how it had been for Yubelluna who had gone from zero to hundred in a second.

"Hm… I'm just… Nh… worried… Ah… That you'll…. Mm… Do something weird again…" Rias ground the words out between kisses. "Uh, can you be gentle? Last night you didn't do much of anything so… I got to kind of do 'it' at my own pace, so…"

"Right, don't worry." Momonga reassured the girl. 'Right, I wonder if intensity and experience gain are linked? I'll have to ramp up the intensity and see if the experience gains stays the same…'

Rias let a 'eep' as her dress was opened alongside her bra, and her considerable melons let a 'boing' as they popped out of their containers.

"Um, could you just, uh, rub it out on me? I'm not sure I'm ready to go 'in' again today?" Rias seemed to mentally backtrack her earlier resolution as Momonga shed his clothes as well, and she got a look at the exposed experiment tool downstairs which pointed directly towards her.

'Hm, well, I suppose that could be used as an experiment as well, seeing if indirect action triggered experience gain…' Momonga felt resigned as his attempt to indulge his research was denied, but he felt that he should probably consider Rias's opinions as well.

The thought caused him to pause for a moment and he looked into his mindscape to see that Touch Me-plushie had escaped the 'prude jail' and was chasing after 'Momonga' with a bat, while the latter was trying to explain that his scheme was made with intent of strengthening them as a whole. Unfortunately that left Peroroncino-plushie entirely unchecked, and Suzuki Satorou wasn't taking sides so it was left to the pervert's hands now.

So, since the direct approach was blocked, Momonga turned Rias around on the bed so that she was straddling on top of him, rubbing her neatly trimmed bush against Momonga's tree which had flattened against his stomach.

Since normal forestry wasn't an option, a alternate solution was proposed and agreed to by internal council of Peroroncino and co, meaning that Momonga placed his hands on confused Rias's hips and moved them a bit forward so the girl's bush slid along the tree, causing the red-head to gasp and blush hard.

"A-ah, right, that way… uh, I'll try..:" Rias seemed to get the general idea and moved her hips in the way that had been shown to her, causing her breath to become ragged as the rubbing motion was quite harsh on her sensitive spots. "Hng… D-does this feel good?"

"Yep." Momonga noted as he analyzed the physical stimuli, and Rias blushed harder while she moved her hips back-and-forth. "Do you feel good as well?" 'Indeed, one more factor to consider: both parties's enjoyment. Indeed, I should have probably considered this from the start…'

"Y-yeah…" Rias's breath caught as she slid a bit further than before, almost causing the tip of the tipped over tree to slide into her entryway. "Ngh… Y-you know, it's… it's getting a bit… hot in here, right? Uh, it's alright if I, uh… ngh... "

"Would you like to put it in?" Momonga noted that the girl seemed to be passively increasing her arousal 'meter' 'Indeed, is this the 'foreplay' Yubelluna mentioned? Sheesh, I didn't even think of that… I'm getting so much experience from this… I wonder if I could use this experience to fuel my spells and abilities that consume experience? Would the source of the experience affect the spells?'

Rias blushed and nodded cutely, before lifting her hips a bit so the wood stood up straight again after getting bent against Momonga's stomach by Rias-named storm, and the girl slowly lowered herself on it. "I… kind of wanted to make this more romantic… but… I guess this is fine too…"

"We can stop if you want to…" Momonga noted, feeling a bit disappointed.

"Hng…" Rias, however, seemed that her hesitation was only a bluff as she lowered herself down fully, until the wood was thoroughly wrapped. "H-heh, it's like last night…"

Momonga realized that the 'experience gain' from last night had been nearly nonexistent, making him note one more important factor. 'Aha, so participation matters…'

Rias let out a 'eep' as hips thrust against hips, causing the girl to jump a bit, before crashing back down. "Hya! T-tell me first before you move like that! I almost c-uh, j-just don't do that without tell-eeeh?!"

Momonga rolled her around so she was below him after casting [Perfect Warrior], figuring that if the girl had similar 'reactions' to proper 'action' as Yubelluna then he'd need the extra durability. 'Or, I wonder, since I gained good amounts of experience as 'caster', is the gain altered as 'warrior'? Ho, now I'm getting excited…'

Rias let a grunt as the first thrust came, then followed by quite a few and each one reaching to knock on her door. "Wa-wa-wait, hold on, uh- Ngh! W- aha! Hya! N-not so deep, I can't… it's too much!"

The girl's eyes widened as Momonga reached to his inventory behind his back and pulled out a can to her field of view.

"Wawawawa!" Rias tried to halt him, but Momonga had something else on his mind.

He offered the can to the girl, causing her eyes to shoot wide open. "Wah?"

"I figured that we might as well go for it properly since it's just the two of us now…" Momonga explained, masking his hidden intention to gather as much data as possible and amass as much experience as he could at the same time.

Rias gulped before taking the 'mana potion' and drinking it down in one go. "U-uh, this is going to get a bit crazy, isn't it?"

"Most likely." Momonga's answer didn't help the girl.

Nor was the thrust that followed, or the one after that.

Roughly two hours later, Rias Gremory had found out that lovemaking with 'passive Momon' and 'active Momon' were two entirely different worlds.

'Did I just get enough experience to almost level up? I feel like it, at least… Interesting. I gained experience with Yubelluna, but now that I keep an eye on it… That's not an insignificant gain per 'act'.' Momonga wondered as he let Rias flop down on the bed, the girl looking like a severely leaky can of yogurt after the prolonged 'experiment'. 'I feel like I could summon an Overlord Wiseman without losing multiple levels… I should have guessed this ero-world would work like this when mana potions were 'lewd'…'

Rias mumbled something against the pillow,

Momonga heard it and went to lie down next to her, allowing her to snuggle in close to him.

"You're so going to be having multiple girls in your bed from here on out… I'm going to break if we do this multiple nights in a row with just the two of us…" Rias grumbled. "You're insatiable, and a pervert."

"Guilty as charged." Momonga sighed as he realized the words were quite true by now. 'Indeed… I have become what I have sought to resist.' "But in my defense, this whole world is perverted."

"Pft." Rias hugged herself against Momonga's chest and fell asleep.

'...I guess this isn't bad either. It's normal for a person to do this, right? It's not too perverted, if it's with one's wife?' Momonga thought. '...I'll just have to be really careful or I'll turn into a mega-pervert…'

Suddenly the memory of Rias's description of Momonga's host body's original owner popped into Momonga's mind. 'I should probably look into a possibility if inhabiting 'Issei's body is actually turning me into Issei…'

The memory caused Emotion Suppression to activate, all the while Rias snored lightly against Momonga's host body's chest.

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Note: Slightly darker chapter incoming.