This is probably a bit weird to ask, but is there a bl where everyone just turns gay for t...

This one is the only one I can think of, but I believe the Author dropped this, so It feels unfinished.
http://www.mangago.me/read-manga/bokura_to_usagi_no_koi_wa_sensou/

Uh this manga isn’t exactly as you say but this is what I thought of when I read your post.
http://www.mangago.me/read-manga/shiawase_gohan_maki_to_hanazawa/

http://www.mangago.me/read-manga/please_save_the_fox/

Omg thanks, this is exaclty what I was looking for, but there's only 3 chapters TT.