My friends alway make fun of me and because of my fiancé but last time she showed them

so my friends and I usally make fun of each other mostly I’m the target tho they also make fun of my fiancé ofc not in her presence they call her dog face and plank bod (sometimes even not so cool things bad she’s Asian) I always tell them to stop but they just keep overpowering me and one time it slipped past my lips that there’s more to her then they can see (since she mostly wears baggy pants) and that sometimes I have problems getting past her cheeks .. so now they call me tiny and keep making fun of her since they won’t believe me (I told her and she said I should ignore them) last time they were at my place bc we wanted to go out all together my fiance was in the bathroom making herself ready and we were in the living room and ofc they started again idk if my fiancé heard them or not but she went outside said she forgot something and walked past us in a top and only in panties and I saw every one of them look and stare at her ass I got hard immediately and they didn’t say anything after that but I saw every glance they they threw at her her and it made me even harder the whole day.