Twincest or Incest

I kiss my twin sister in the mouth. 

Chou~chou~

I enter my tongue inside her mouth, roll around her tongue, and drink her sweet saliva. Shina too enters her tongue in my mouth and sucks my saliva. 

Kissing a face that looks like me feels weird. It's like I am kissing myself.

We stopped kissing when we were out of breath. Then without wasting any time, I took her clothes off and she took mine off. 

Then I stare at my sister's naked body which I haven't seen since we were in elementary school. Feeling my lustful gaze on her body Shina hides her boobs and pussy with her hands. But It looks sexy like that too. 

'You look sexy, Shina.'

Shina blushes in embarrassment and says sweetly, "T-Thank you, Onii-chan." 

'Let me see your beautiful boobs, Shina. Don't be shy.' I took her hand off her boobs and two perfect-sized boobs with a pink cherry on each came into my view. 

Then I touch her boobs with my hands and feel heavenly soft to touch. 

'They are the perfect size for my palms to hold as if they are made for me to touch them. Wow! They feel soft to the touch too.' 

"Onii-chan~ It feels good~ Touch my boobs more~ fondle them~ please~"

'As you wish, Shina.' 

I started fondling her breasts. Sometimes I pinch or rub her pink erect nipples while fondling. 

"Ahh~ it feels good~ my boobs feels good~ Onii-chan~" 

Seeing her lewd moaning face arouses me too. Then I take her nipple inside my mouth, lick and suck on it. Even though no milk comes out it tastes sweet. When I am sucking like that, her hands get behind me and gently pats my head. It feels like I am a baby sucking on his mother's nipples. 

"Fufufu~ Onii-chan looks like a baby sucking on my breasts."

Feeling embarrassed called a baby by my sister I start sucking on her nipple harder while pinching her other breast. 

"Ah~ Yess~ Onii-chan suck my nipple more harder~" 

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In a room, two siblings are doing something naughty which is taboo in society. But no one can stop them in this world where there is no human to begin with. They are free from social taboos and social restraints. Nothing can stop them now.

On the bed of the room, Shino is licking and sucking on his twin sister's pussy. While his twin sister, Shina is moaning in pleasure from her brother's cunniling. 

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When I felt her pussy was wet enough I stop licking and sit up. Then I grab and aim my rock-hard dick at her pussy entrance and look up at her. Shina seeing me looking at her nods at me. Then I slowly enter my dick inside her pussy. Halfway through something gets in the way. Fully knowing what it is and what I have to do, I pull out my dick leaving only the tip inside then thrust inside her pussy hardly. Breaking her hymen on the way my dick enters fully deep inside her pussy. A stream of blood trickles down through my dick from her pussy.

"Ahhhh! Shit! It really hurts!" Shina screams in pain. So, Leaving my dick fully inside her like that I lie down on her and kiss her on the lips to relieve her from her pain, even a little. 

After sometime, 

"Hm, Onii-chan..."

'Yes?'

"You c-can move now." 

'Really! Weren't you in pain?'

"I am fine now. S-So, fuck my pussy Onii-chan."

'Hahaha...Of course gladly.'

Then I took half of my dick out and thrust inside again. 

'Fuck! Your pussy feels so good, Shina! It's so tight.'

"Me too. I feel good too. Onii-chan, fuck me more. AAAH~"

I start pounding my dick inside my sister's pussy and feels so good. I didn't know pussy feels that good! And that too my twin sister's pussy. Ahh~fuck~ Sorry, Mom. Sorry, Dad. Even though I shouldn't be doing it to my sister. But what can I do when It feels so good to fuck her? Mom and Dad, sorry. Sorry, for fucking your daughter's pussy. Hahaha...

"Kiss~kiss~ Kiss me Onii-chan~~"

I did as she asked. I kissed her while pounding my dick inside her. 

Chou~chou~hhaa~haa~chou~

I started pounding roughly and faster. 

'Chou~haa~ I am coming Shina~ I cuming~'

"Yess~yess~me too~ I coming too~ Onii-chan~ come inside me Onii-chan~~ahh~"

'I cuming~I am cuming~ Take it~ Take all inside your womb you slut~ahhh~'

With a deep thrust, I came inside her womb. I cum a load and filled her pussy with my cum. 

Shina too started squirting her love juice on the bed.

After that, we fall asleep like that without taking my dick, naked. 

--------------

In the morning, 

"Onii-chan! Onii-chan!"

'Hm?'

"Come on, wake up, it's morning already."

I slowly open my eyes and find Shina standing by the door dressed neatly.

'Oh, good morning. You look beautiful Shina.'

"Eh! I-If you are wake come down. I-I am going!!" Shina blushes and runs off but her smile doesn't go unnoticed from my eyes. 

Hahaha...She looks cute!

Now then, 'Systa...' 

When I cum inside Shina a window appeared in front of me. But because we were tired as it was our first time we didn't notice. 

Now that I see it-

[Chose, if you want to make her pregnant]

Yeah, as I thought I should discuss it with Shina first. 

As I rose from bed, I selected a new dress from the closet and got dressed. Then after washing my face, I went downstairs to the dining room.

I sat down on the table in the dining room. 

Shina was preparing breakfast in the kitchen beside the dining room. By the way, the kitchen is very big.

Even though from here, I can only see her upper body wearing an apron, she looks like a housewife.

'Shina, did you see the notification from Systa?'

"Hm...No, What kind of notification, Onii-chan?"

'Let's see it together then, Systa...'

[Yes, Here you go-]

[Chose, if you want to make her pregnant]

'What do you say Shina? Do you want to become pregnant?'

"O-Of course. I want to. Hehehe...' Shina started blushing and daydreaming.

'Okay, then I chose to make her pregnant.'

[Target Shina has been impregnated with Shino's child] 

"Ehh!"

'What's wrong, Shina?'

"It's nothing I just felt a tingling in my womb."

'Fuu...Okay.'

[Chose a race for your child]

"What! Does it mean we can choose a race for our child too?!"

[Yes. You can.]

"Wow!"

'So, do you want to do Shina?'

"Hmm...I want our first child to like us."

[Race Human selected]

'Okay, good.'

[How many children do you want?]

[1. One

2. Twins]

'What to do like Shina?'

"Twins!!"

'Are you sure? Can you do it?'

"Yes!! I can, Onii-chan!! They will be like us. Twins...hehehe..."

'Sigh, as you wish. Select Twins Systa.'

[Okay, Twins selected.]

[Chose gender for the twins]

[1.Both Female]

[2.Both Male]

[3.One Female and One Male]

[4...]

[5.....]

'Systa, chose no. 3.'

[Selected No.3. One Female and One Male.]

"Yeah!! I'm pregnant. Hehehe..."

'Are you really that happy because you are pregnant?'

"Of course. I am pregnant with none other than my Onii-chan's child. How can I not be happy? Hehehe..."

She really looks happy right now. At first, I thought she wouldn't be happy to get pregnant with my child but looks like I was worried for nothing. 

With gentle eyes, she is patting her stomach. She really looks like a mother now, huh...

'Why don't we think of some names for our two children who will be born in the future?'

"Yes, Of course we should."

[Why don't I choose some for you?]

"Really!! Why not?"

[Okay here are some names I came up with- Stim and Clor. What do you say? Are they nice names? I am sure you liked it already. Hmph...]

"..."

'...'

[W-What wrong you two? Why aren't you saying anything?]

"So what I was saying was..."

'Yes, Yes. I get it. It's like..."

[W-Wait, wait. Are you ignoring me right now? Hey, Shino. Hey, Shina. Come on you two!!]