Just go back to sleep

You are too wiped out to respond to Abbie with anything more than a grunted “uh huh.” Certainly, you aren’t going to start the conversation about how she’s been going too far with her teasing right now. That can wait until it’s morning and you’ve had a huge coffee. The old, beat-up mattress is soft enough considering how tired you are, and it feels good being cuddled by your sister. You close your eyes, and almost immediately drift off to sleep.

You don’t know what time it is when you are awakened by the muffled sound of soft, high-pitched moans, the feeling of a body rocking against your back, and the sensation of something rubbing over the crotch of your jeans. Your cock is already hard, reacting to the feeling before you were even awakened by it. You can see it’s still dark out. It takes you a few moments to orient yourself and remember where you fell asleep. And just a second more to remember with who.

As the fog of sleep clears from your mind, you realize that the rocking body you feel is your sister’s. Still laying on her side, pressed against your back. One of her arms is between your two bodies, moving in a way that makes it obvious her hand is between her legs, rubbing. Her other arm is wrapped around you and the pressure you feel grinding on your hard on through your jeans is her hand.

Abbie is panting out little ****-sounding grunts in time with the rocking of her hips. “mm…mm…mm…mm…” Suddenly she stops moving and her moans became just heavy breathing. Her hand moves off your dick, and her arm around you goes limp. She must have sensed your body tensing or a change in your breathing, and realized you had woken up. She lays still. You can feel her body shivering against your back.