No Booty?! Sex advice, please?

Okay, Ladies, soooo......I have NO ASS. Literally NO ASS! But, guuurl. I really lowkey want to have sex with this guy. But, I'm scared that while grinding, my bones are gonna hurt him😐. I'm just wondering, what positions can I do if he has nothing to grab onto, and if grinding hurts him?!😭Please help me