I kinda forgot the title of an omegaverse manga where alpha is actually a bottom(he's tall...

I kinda forgot the title of an omegaverse manga where alpha is actually a bottom(he's tall and has dark hair) and the omega is the top(I think he had orange or yellow-ish hair??). The omega transferred to the office and later he was in heat and the alpha was there and wore his pants down and faced his butt to the omega.