Chapter 11: Forbidden Thrill [R-18]

"Tsubasa-kun, how long do you plan on staying holed up in your room? Kaa-san and otou-san are already downstairs waiting for you. And where's Yui-san? Didn't Mom ask her to come and pick you up?"

Yui was inches away from swallowing my dick whole when the voice of a young woman interrupted from the other side of the door. It was a familiar voice, one I'd grown up hearing.

"God, even Akane is a damn cockblock," Yui grumbled, finally pulling away. "I'm here too! Onii-chan just wouldn't wake up, no matter how much I shook him. So, I had to resort to sneaky tactics."

"Sneaky tactics? Are you two fooling around again?" The voice on the other side sounded impatient. "Well, is he up now?"

I didn't bother answering, as Yui decided to speak up for me.

"Yeah, he's up alright." She grinned at me with that wickedly playful expression.

"Well, in that case, get a move on and head downstairs. The food's going to get cold."

We heard her footsteps fading as she went downstairs. Once her footsteps were no longer audible, Yui turned to me, her smile sending a cold shiver down my spine.

"Don't think for a second that you're off the hook, onii-chan. I'm nowhere near done with you. You can't escape my affections."

I had a gut feeling that she'd pay me a visit in my room later tonight. To be safe, I made a mental note to lock my door before going to sleep.

"Alright, Yui, untie me now."

"Fine, fine."

She released the bonds, but an undercurrent of malice lingered in her actions. Was she angry because I'd had sex with Chinatsu and Natsumi? That seemed like a likely reason. Clueless as I could be at times, even I recognized that Yui held some sort of twisted affection for me. I cared about Yui too, but as my sister. I had assumed we'd remain siblings, but it appeared that her intentions were far from that.

What the hell was I supposed to do now?

×××

After dinner, I figured I should hit the bathroom. I had a bit of a sweat going on, and considering I just had that weird event with Yui, I thought a bath was in order. The last thing I wanted was for my old man to catch a whiff of my scent, mixed with Yui's, and turn it into some horrifying interrogation. No thanks.

Lost in thought, I pushed open the bathroom door and stepped inside. One by one, I peeled off my clothes and let them fall to the floor. Once I was naked, I stepped into the shower and let the water cascade over my skin.

As the water beat against my skin, my mind began wandering back to that threesome with Natsumi and Chinatsu. It wasn't like I wanted to recall it, but damn, that memory was etched into my brain. It was one of those unforgettable moments, no matter how hard you tried to shake it off. A foolish grin tugged at my lips as I replayed it in my mind. And, of course, my dick responded by getting hard.

But just as quickly, my thoughts shifted to my encounter with Yui. The moment her scene popped into my head, my grin froze in place. My body betrayed me, my dick twitching involuntarily at the memory. What the hell, man? Get a grip on yourself.

But no matter how much I scolded myself, my body seemed to pay no damn attention. It was like my body was an open book, and it was being brutally honest. It wasn't entirely unexpected, I guess. I mean, I was always sporting a hard-on when I was alone with either Natsumi or Chinatsu in their rooms. Hell, there was even that one time where Chinatsu and I ended up having mutual masturbation because my body just couldn't hold back.

But I hadn't realized just how freaking honest my body could be. Seriously, my mind was flooded with all these things I shouldn't even be thinking about. I knew it was wrong, especially considering Yui was my younger twin sister.

Yet, there was this forbidden thrill coursing through me. It felt like I wanted to dive into that immoral abyss. I wanted to do the unthinkable. I wanted to fuck Yui. I was dangerously close to going all sweet home Alabama with my own damn twin sister.

But I had to get a grip on myself. Going down that path would spell disaster for both of us. Yui would get dragged down with me. If Dad or Mom or even Akane somehow caught wind of the immoral shit we were up to, I didn't even want to think about the fallout.

Still, I couldn't help but wonder. What would've happened if Akane hadn't interrupted? Would we have taken things even further? Seriously, it was fucking messed up.

Before I knew it, I was doing the unthinkable. Yep, I was starting to jerk off. And I wasn't picturing my two girlfriends in my head. Nope, I was imagining my sister. I was trapped in this bathroom with my mind going down a seriously twisted path. I had to get this load off my chest. I tried to redirect my thoughts to Natsumi and Chinatsu, but they kept morphing back to Yui.

Yui this. Yui that.

So there I was, getting off while thinking about her. And after I finished, spewing onto the bathroom floor, all I could do was sigh.

"What the hell..."

Finally regaining a bit of clarity, I realized what I'd just done. I'd jerked off to my sister. My blood-related twin sister.

I didn't know if this counted as cheating, but regardless, getting off to another woman, let alone my own sister, was a mistake.

I had to make things right with Natsumi and Chinatsu. Even if I couldn't explicitly say I was sorry, I had to do my best to show them a good time. And if, by some chance, I found myself still fixating on Yui instead of them, then I had to scrub her out of my mind.

And if that meant sealing the deal with them through sex...

To overwrite a memory, you needed a stronger one, right?

Yeah, that's the plan...

Tomorrow after school, I'd try to arrange a threesome with them at the school.

What a mess...