My friend was having a sleepover, we were in her bedroom, when her sister walked in with just a towel wrapped around her. She asked my sister if she could borrow something and stood over me to get it but the way she positioned herself I could see up the towel.

Later on in the middle of the night, I was walking to the bathroom (you have to pass her sister's room to get to it) and I couldn't help but peak inside. There she was naked, asleep on the bed. For some reason I don't know why I walked in