Responses
Sound like this one..
http://www.mangago.me/read-manga/yukyu_omega/
Yesss it's that one
Thank you (⌒▽⌒)
It's omegaverse, the alpha and omega are working in the same company. The omega always takes a week off whenever he goes into heat but actually his heat only lasts for a few days. Alpha visits him one day and forces himself on omega and ends up bitting him.