One of my favourite kinks is women's underwear, over the years I've converted my partner from basically granny panties to thongs and just recently her first g string. Every night I wait until she gets into the shower then I'll follow her in and check how wet and messy her undies are. If they are how I like I have her poke her rear end out of the shower and I play with her pussy for a bit, but if they are dry and clean I tell her how disappointed I am with her and sometimes I will open the shower door and pee on her (she hates it) just to show how disappointed I am with her. If her undies are really wet sometimes I'll rub them on my dick just for a small hit of satisfaction.