Succubus Miboujin Hirusagari no Himitsu

Yamazaki recently got a new job and moved into a new apartment. His life was going well, except for one thing: his neighbour is drop-dead beautiful widow that oozes sexyness from every pore. With her around, he has trouble concentrating and his mind is filled with nothing but fantasies of having sex with her.
Even more, he’s been recently starting to have urges: he started yearning to be devoured by her. One afternoon, she invites him to her apartment for lunch. There she reveals a truth about herself: she’s a succubus and her late husband died because he was too frail so she ended up “devouring him” completely. Hearing those words, something snaps inside Yamazaki and he asks if she would devour him too...
(Source: 2DMarket)