I [M18] fucked my sister [F20] at a party. She still doesn't know.

Everyone is over 18.

Carrie and I are about 18 months apart in age and we have always been one year apart in school, until now.

Carrie is the kind of person who does everything right. She studies hard in school, working hours a day on homework. When she isn’t studying she is either at the gym or volunteering for a good cause. She is, in short, perfect in every way and this is because she actually works for it.

I am the kind of person who never studies, waits until the day before an assignment is due to start working on it, and somehow I manage to almost achieve the same grades as Carrie. My hobbies are playing video games, which the stupid state school we go to considers “e-sports.” I got a scholarship! Everything in my life has just fallen in my lap.

In short, we hate each other.

Carrie took a year off before college to volunteer for Greenpeace, so now we are both freshmen at the same state school. It’s a big school however, so our paths don’t ever cross.

It is late at night, I’m at a party in one of those houses around campus that are always throwing parties. It is not a fraternity house, but it has the same kind of vibe as a frat party.

In one corner, there is a girl on a couch. Her head is buried in the cushions, her ass is in the air. Her dress is pulled up, and her shaved cunt is visible to the room beside a thong pulled to the side. People are cheering as she starts stroking herself.

Another girl, a pretty blonde chick I recognize, vaguely, from one of my classes, I can’t remember her name, is slapping the couch girl’s butt when she announces, “biggest cock get’s to fuck her!”

A couple of guys come up, and show the blonde their cocks. She shakes her head at each one, and the guys each walk away embarrassed. I don’t get to see their cocks, but the looks on the other people in the party make it clear nobody is impressed.

I’m hard as a rock watching this, I pull out my cock. The pretty blonde chick looks at it briefly, looks at my eyes and I see a flash of recognition. She gives me a big smile, which I return. “You.” she says.

I walk over and the blonde chick, Kitty? No, Kat! Kat from Econ 101. Kat guides my cock into her friend, stroking me as I fuck the poor girl. After a few strokes, I look down at the hand of couch girl, spreading the lips of her shaved cunt as I plow it. On the wrist is the ridiculous comic-sans Greenpeace logo. I recognize that logo. I look at Kat. She knows! Kat knew who I was. She has a wicked smile on her face.

I pound my sister hard, then. I dig in, and hear her moan. “Big Cock,” I hear from inside the couch. Kat smiles and pushes me, into couch girl. At one point, Kat starts kissing me while I fuck my oblivious sister in front of a crowd of onlookers. “Come inside her,” Kat whispers in my ear, and my cock obeys before my mind can stop it.

I pump my big sister full of semen, trying to stay quiet so she never recognizes my voice, but failing as I groan in pleasure. I hear Kat, who must have been touching herself, moan with an orgasm as the pussy spasms and squeezes my cock out.

I pull up my pants, and try to get out of there, well before Carrie realizes she just took a full load of her brother’s hot cum. Kat runs after me, and hands me a piece of paper. Her phone number.