Reply: 21F On each of my friend’s birthdays, I become freeuse for them. 

Whenever it’s one of my friends birthdays, I become freeuse for them. There are a few rules like they can only fuck my ass once and with a lot of lube, and that I’m only freeuse for them meaning that I’m only freeuse for whoever’s birthday it is. Not the rest of my friends. This happens on the start of their birthday day until the very end. So if they wanted to, they could stay over and then at midnight once it’s finally their birthday, start fucking me even if I’m asleep.
Just to be clear, I don’t just have sex with them on their birthdays, I sometimes do it other days too, but their birthdays are pretty much the only days that I’m freeuse for them. Also while I’m only freeuse for them, that doesn’t mean I won’t have a threesome with them and another friend on their birthday. It just means that I get to decide instead of them.