S-Toxin

Plagued with splitting headaches, Jimin finds a doctor who diagnoses him with terrible news: he will die in three days unless he consumes someone else's load. Jimin dismisses this as a quack doctor's perverted scheme... until he wakes up to a mysterious screen counting down to his death. Seeing that the screen also states the same cure as the doctor did, Jimin decides to swallow the truth and the cure. Thus begins a series of steamy encounters that will save and change Jimin's life entirely.

(Source: Tappytoon)