So for a long time when I was younger living with my dad, two step sisters and step mom I used to steal a few things from their rooms. Mainly very dirty used panties. This was usually straight after they got home from the gym together. Every couple of days I would switch between them so change it up a bit. When they went into the shower I would sneak into their rooms and quickly steal the used smelly gym panties.

Sometimes they weren't in the room so my guys they got undressed in the bathroom so would just steal another not as fresh pair from the laundry basket.

I would either sniff them and rub my cock in their room or fully steal them and go rub them on my cock in my room. Sometimes they were so fresh they would still have wet stains and sweat all over them.