This Club is Disgraceful!

Yiban is a perfectly normal student who joins his university's volunteer club only to find its members trying to cure a guy's lack of erotic stimulation through unconventional means. Horrified by their crazy antics, Yiban tries to make a run for it... but is stopped by an unexpected reaction in his pants! Although he swears that he's straight and hates this chaotic situation, he has a feeling escaping this unconventional club won't be as easy as he thought.

(Source: Tappytoon)

Note: Includes one extra chapter.