18+ Zako Succubus-chan wa Semen ga Hoshii no!

Soichiro is a virgin, a bookworm, married to his homework: the perfect target for any succubus wanting to cut her teeth, right? But little does Milly know, he's got a monster cock and the stamina of a linebacker! Instead of being an easy first target for her to test her succubus wiles, Soichiro pounds her pussy into mush—and to make things worse, succubi are automatically imprinted with an ownership crest when a human male makes them cum! Soichiro is Milly's master now, but at least he's got a big dick and loads of creamy cum to sate her succubus appetite...that is, if she can rip him away from his studies.

(Source: J18)