First Time With Her?

Okay sooooo I'm a Junior in high school (17years old) & I have a friend lets call her B. Well B and I decided to be FWB bc she's bi-curious & I feel like I'm very confident in my gayness so she asked me & of course I agreed (duh) but I'm HELLA nervous bc this is going to be both of our fist times having sex with another woman. Any tips or concerns I should know about??😳😅