Taking pictures

You see Katie taking pictures of your cock, which is now sticking out of your pajama pants despite your best effort. She's taking pictures of her own snatch, spread wide open, literally dripping pussy juice on the camera, and she's taking pictures of your sister's ass as you hug her.

It's only then that you realize she's using Jess's phone. That realization made your cock throb and push the rest of the way out of your pants, straight into your sister's thigh. Sub consciously, your sister's hand brushes it, and you almost cum from the electric, accidental touch.

Jess jerks away and closes her eyes.

"FUCK! Tom, I'm sorry!" she says and you quickly tuck your fuckstick back in your PJ pants, but there's no way it's going down. Your sister's hand was soft and warm, and it was everything you'd ever want in a hand as it brushed against you from root to throbbing head. You bite your lip, thinking about what other soft things your sister might have, and your cock throbs again.

"It's okay, it's just Katie being a filthy slut," you say and give your sister a different hug, staying to the side. Jess's head is craddled on your shoulder and you look at Katie to see her mouth, "I'm going to make you two fuck like animals."

With that, Katie spins away, skipping to her room, flashing her pussy to you one last time before she closes the door after going inside.

"God, what a whore. I can't believe I touched your....Jesus...I'm so, so sorry!" she said, a tremble in your voice. "Let's just forget that ever happened and please go get dressed, we'll get out of here for the day. You nod and head for your own room.