She is a little fat too. She's been texting me, wanting to go out with me. I don't even wanna be seen with her somewhere. It's embarrassing. But I could have sex with her. I thought it would be good to have sex just to lose my V and have some fun.

How should I tell her I want a FWB relationship with her? Should I tell her after we have sex or before? Should I even go for it?