Peach & Musk

Jung Yoojun, a Beta, recently gains a new roommate named Seo Kihyun who is an Alpha. The two lived normally for a while until Yoojun started releasing pheromones that enticed Kihyun. As an Obtained Omega, Yoojun doesn't want to be hospitalized, so Kihyun helps him in a sensual way.
(Source: INKR)
Includes two extra chapters