Responses
Yukyu omega
It's not the same but pretty similar
http://www.mangago.me/read-manga/fucked_by_my_best_friend/
beta
I read an alpha/omega manga where a guy pretended to be an omega so he could go home and relax every month and to have an easy life but I can't remember the title! He either was not an omega or didn't have symptoms but pretended to have to go home because of his "heat" every month.