Imagine your mom has a helper in the house.
You are walking along the room as she is cleaning and want to get a peek at what is going on in there.
Suddenly you reveal the helper is some kind of nylon fetishist rubbing her pussy covered by your mother's nylons! What an outrage! But when she proposes to play with you in exchange of you being quiet about her fetish, you start to think this could be a nice experience. So just get your helmet ready and get to it!