<human>: Could you distill the essence of the text into 1-3 sentences?

Okay, this was actually last year July-ish but i've been waiting for a long time to tell it so here it goes.  So I have this friend, lets call her Sarah. Sarah's parents go out of town so she decides to throw a huge party and invites all her hot friends. I can sense that one of them in particular, lets call her Kayla, is into me. So we pour shots, play a few rounds of pong, and proceed to get very wasted. One thing leads to another and before I know it, we are in a guest bedroom upstairs, lights off and most of our clothes off. I can tell that she wants to have sex, but I have to piss really badly. So I tell her i'll be right back and walk across the hall to the bathroom. Once I finish up, I start making my way back to the room. I open the door and slide back into bed. Kayla has become strangely quiet but I know she's there because I can see her figure in the dark under the covers. I thought she had fallen asleep and I wasn't that eager for sex anyway, so I figured we could spoon for awhile and fall asleep instead. Five minutes into the spoonfest, I turn the light on so I can find my phone on the nightstand. I glance over to the bed and my stomach drops to the floor. The girl in the bed isn't Kayla. Its Sarah's 14 year-old sister, fast asleep in her room. I'm 21 years old. To this day, I haven't told a soul.
<bot>: Walked into the wrong room at a party. Ended up spooning with my friends 14 year old sister by accident.