Yandere Sister

“All your sperms are belong to meeeee, Big Brother!!!” she squealed as she mounted my cock and started bouncing up and down on it. “Oof, oof, oof, oof, oof…”

I had awakened that morning tied to the bed… again, Suki standing naked by the headboard poking me with a ruler. “Attention. Attention, Big Brother. Your morning wood is required immediately!”

It had been a rough year since Mom and Dad’s accident left Suki and me alone to fend for ourselves. Suki had started community college and I was already working for a construction company, so there was money coming in, and the insurance took care of the rest.

Suki had taken it hard. Especially the first month. She’d always been reserved, quiet, shy… nerdy. Medium length hair always in pigtails. Skinny. Seldom wearing any makeup except for her eyes, just to make her look a little more oriental, like the anime girls she constantly watched and emulated. She was as Kwaiii as they come. Her tiny breasts barely filling the training bras she wore under her t-shirts. Most guys wouldn’t look twice at her and think “girlfriend material”. And immediately after the funeral she’d just withdrawn into her own quirky little world for a while.

Which I guess is what led to this. “Oof, oof, oof, oof, oof…that’s it, Big Brother…Suki needs all your sperms in her tummy!”

Yeah, she was plain looking, but her pussy was to die for. Truly a velvet vise. And yeah, I’d had a few girlfriends with benefits enough to know the merely good from the truly exceptional.

Staying in the house after Mom and Dad had passed. We had left their room just as it had been. I don’t think it occurred to either one of us to do otherwise.

I’d been making out on the couch with this girl I’d picked up, when Suki got home from class. It was a little awkward, and the girl was hinting we should move things to the master bedroom. That’s when Suki freaked out and poured a glass of ice water over us. “You. Will. Not.” She shrieked.

Needless to say, the girl bolted for the door flipping us the bird and calling Suki and me every name she could think of.

After she had left. Suki got all up in my grille shaking with anger. “You will not fuck your sluts in Mommy and Daddy’s bed!”

“Sis, they’re not coming back.” I replied, realizing the truth of it fully for the first time. That we were alone in the world.

“Don’t you fucking say that!” she screamed at me. But in her eyes I saw the same realization dawning on her as well. In silence she flopped down sullenly on the couch and folded her arms looking aimlessly away at a spot on the floor.

I stopped bringing girls home after that. In fact, I stopped dating altogether. It seemed pointlessly difficult. If I even suggested that I might see someone, Suki would bristle and sulk for days.

So life became a routine of meals and work and sleep. Suki going to classes and then endlessly watching Moe anime series after series, somehow finding an endless supply to the point where they all blended together for me and I couldn’t tell if she was watching the same ones over and over, or whether they were different ones. But it had become the only thing that perked her up, so I kept my mouth shut and tried not to pay too close attention.

I suppose that was the genesis of the idea for her.

“Oof, oof, oof, oof, oof… Yes! Big Brother! You’re cumming in Sister! It feels sooooo good, Big Brother!!!” She was smiling at me, her eyes aglow as I felt her pussy convulse on my cock, milking every drop out of me.

It had been a long day of hard work, and I had dozed off watching TV after dinner. I’ve always been a pretty sound sleeper, but I must have really been out cold, because when I woke up my wrists were handcuffed behind my back and my pants were on the floor.

Suki came into the room wearing just her training bra and white cotton panties. “Hey Big Brother! Welcome back to the land of the living!” she announced.

“What’s this all about?” I asked in surprise.

“Welllll Big Brrrrother, I wanna ride your man meat!” She rejoined enthusiastically.

“No way! That’s fucked!” I retorted.

“Yyyyep! But it’s what I wanna do!” She grinned. “I’ve thought about it lots. And you haven’t been getting laid lately, anyways! Squeee!”

Looking at her I could see a wet streak soaking through her white cotton panties. She was serious! She undid the clasp on her bra and stepped out of her panties, and stood in front of me for a minute. Quietly but intently watching as I got an erection. Yeah, I hate to admit it, but she’s a girl and I’m a guy, and seeing her naked for the first time, sister or not, I couldn’t help but think that in her own quirky way, she was kinda cute.

Her tits were larger than I expected them to be. Not large enough to bounce, but just big enough to jiggle. Her pussy was truly breathtaking, topped by a bush that I was sure had never seen the cold steel of the trimming scissors, and very pronounced labia, that hung down between her thighs. My cock was pointing almost straight upwards.

“There!” She announced in her perkiest voice. “It’s ready Big Brother! Lets Goooooo!!!” and she straddled me right there on the couch riding down the length of my shaft in one shot at terminal velocity.

“Oof!” She grunted. She was going so fast I didn’t even feel her cherry pop.

“Oof!” Her tits jiggled when she bottomed out.

“Oof… Hey this feels reeeeeally good, Big Brother.” She grinned as wickedly as she could.

“Oof, oof, oof…”

I couldn’t believe she was doing this, but I also couldn’t believe how good it felt. I just wished my arms were free.

“Oof, oof, oof, ooffff, oh, oh, unnnnnnnnh, gggggggllllllll.” I watched her entire body blush as she came for the first time.

“Wow! Oof, oof, oof. I liked that a lot Big Brother! It made me get really wet and tingly.” She bragged. “Moreover, I believe it may happen again!”

And it did. In fact it happened several more times before I finally shot my load into her. I mean she was on top of me and I had my hands cuffed, so I really couldn’t do anything else.

Suki dislodged herself from my softening cock and got to her feet. Reaching down to her pussy she felt my cum drooling down onto her fingers. “Thank you Very Very Much, Sir! That was splendiferous!” She said, retrieving her panties and bra and disappearing down the hall to her room.

Which led me to my own thoughts, which were pretty much disbelief. I’d just porked my own sister, and what’s more, it was hands down the best fuck I’d ever had. But point proven, it wasn’t going to happen again. Or so I thought.

The next morning was Saturday. I woke a little later than usual to find that I was firmly tied to the bedposts of my bed. Suki was standing naked by the side of the bed, obviously awaiting my awakening.

“Aw, Geez, Sis… you’re gonna fuck me again, aren’t you?” I whined.

“You are correct, Sir!” She said and then proceeded to jerk me hard, and then straddled me again.

“Oof, oof, oof, oof, oof.” She bounced up and down on my cock until she’d come several times.

“Oof, oof, oof… I Love You, Big Brother! Don’t you want to put your sperms into my tummy again?” She begged.

Her tits jiggled adorably, and I wished I could reach up and play with them. “Hey! Why do you have to have me restrained?” I asked, hoping she’d let me loose.

“Suki needs to control. Suki doesn’t want to give Senpai the chance to say no to her! Oof, Ooffff, Oh!” Suki came yet again, and shortly afterward I busted a huge nut deep inside her slick pussy.

She flopped onto me and gave me a big kiss. I could feel her tits against my chest and smell her hair… and was she wearing some perfume or was that just the way she smelled? Climbing off of me again she reached down to her vag, and let a little of my jizz coat her fingertips. Almost as if she were checking to be sure I really nutted in her.

Smiling with satisfaction she turned to me and said “Thank You Very Much, Sir. We shall do this again quite soon, I’m sure!” and then she untied me and went out to face the day.

The next morning I was up before she was and went out for a run. Coming in the door I saw her sitting at the kitchen table with her arms crossed staring daggers at me.

“Senpai, why did you get up too early.” She interrogated. “Suki had made plans…”

“I uh… usually go for a run in the morning. You know. If I’m not tied to a bed or anything.” I replied sarcastically.

“Don’t be a smartass.” Suki sulked.

“You wanted to…” I let the rest hang in the air.

“Yeah, so what if I did?” She glared back at me.

“Well if we did, will you stop being such a jerk?” I countered.

“I’ll get the rope.” She said.

“No rope. Not this time.” I demanded.

“I don’t know…” She tried.

“Look, do you want to or not?” I said, making it clear that the negotiation was over.

She got up from the table wordlessly, and started down the hallway to my bedroom leaving a trail of clothing as she went.

I entered the room a few seconds later and started to take my clothes off. Glancing over at her standing there watching me in anticipation, I suddenly caught myself admiring her body. Oh my god, was I developing a nerd fetish on top of what we had already done? But she was really cute in a quirky kind of way.

“Get on the bed, Big Brother.” She said, pointing at my mattress demandingly. So I did.

I was already hard so she didn’t need to waste time with the foreplay. Instead, mounting me directly and starting her usual oof oofs. I waited until she’d cum the first time, and then grabbing her and swinging around I was suddenly on top of her in the missionary position.

It was weird, but height-wise, we were perfect for each other. I kissed her hard and she returned it harder. I drove deep into her with strong strokes that utilized my entire length and made her squirm at the novel sensations. No oof, oof, oof from her percussive cuntal jackhammering, but within a minute she was moaning and cooing, and when it came time for her to cum again, I slowed down and pushed her slowly over the edge. I could feel her gush on my cock and her whole body turned bright red as she convulsed in a shaking climax that made me think she might pass out.