Awkward

So I wanna know if someone knows why this happens or can relate, because it just started happening to me recently.

So basically my bf and I were doing doggy style the other day and he got at some angle where he was kind of pushing air into me, but I figured it was kind of a one time thing and it wouldn’t happen again, but the whole time we did the same position today it was happening and it was super bad (and like loud so extra embarrassing). My bf is super nice tho and we are both comfortable enough together where it wasn’t too bad.