I had a very similar experience
Basically, I was hanging out with a mate and his female cousin watching movies and chatting etc etc at her house. Ive known both of them since we were all 4-5 years old. My mate leaves to go home and I was about to follow him out the door when she calls me back inside for some innocuous reason. I walk into the lounge room and shes not there. Walk into the kitchen, not there either. I walk into her bedroom and she blind sides me from behind the door and topples me onto her bed.
Its pretty much a blur of clothes, limbs and awkwardness from there but it was pretty fun and I didnt get out of there until close to midnight (I had gone to leave at around 7pm). I distinctly remember getting in loads of shit from my mum for getting home so late. From memory I got grounded for a week but f**ked if I cared lol