Wife's Annoying Sis
When my wife and I were still dating, she and her older sister still lived with their parents. Her sis lived in the basement and had her own bathroom, but others could use it.
When I used it, sometimes I rubbed my c*** on her special towel that had her initial on it. She was usually annoying, and you could never trust her not to tell their parents about our shenanigans.
Even though she slept with guys on the first date a few times, we could never trust her not to blab. So I just enjoyed the thought of her drying her hands were I rubbed my c*** and b****.