[Binbi] Curtain no Mukou Gawa ni wa Bishoujo ga iru (Otokonoko HEAVEN Vol. 51) [mysterymeat3]

A curious student stumbles upon a secret in the school nurse's office, discovering that the beautiful girl he admired is actually a boy with a surprising secret. As he investigates the sounds coming from behind the curtain, he finds a stunning person hiding a masculine surprise beneath a delicate skirt. The tension peaks as he realizes that the person he thought was a girl possesses a large, well-endowed member, leading to an intense and messy encounter that turns his world upside down.