Zange Shibori: Sister Succubus ni Shazai Sakusei wo Kyouyou Sareru Ohanashi

“Let’s turn you into a stain on these sheets too, Hero~♪”

Lost on his journey, a young hero wanders off the path. Suddenly, a Sister appears and guides him to a nearby church. Inside, he finds boys and girls who have left their families living together in peaceful harmony. Seeing their cheerful camaraderie, the hero breathes a sigh of relief.
But this Sister harbors a terrifying secret: she is in fact a succubus who lures unsuspecting male travelers into her church, drains every drop of their life‐energy, and transforms them into stains upon her sheets.
Before he can react, the hero is bound just as swiftly as those who came before him. Will he too be added to the Sister‐Succubus’s ever‐growing collection of sheet stains…?

(Source: DLsite, translated)