Zubuzubu ni Aisareru Kara Nanigoto ka to Omottara, Wana Deshita.

"You're so wet… I'll go nice and deep inside you." "Ah… we can't... go any further." Hinako had always dreamed of living on her own. But right after she finally got her wish, for a reason unbeknownst to her, the apartment manager, Harumi, had fallen in love with her at first sight. Although bewildered at first, one "fateful event" sparked a change in their relationship, pushing them to cross a line... With his throbbing member, his touch unlocked a waterfall of pleasure. Making love to her most intimate parts over and over, seducing her until she was under his spell... But lurking underneath it all… "You adorable fool." Harumi suddenly reveals a different side!? Could it be that he's been harboring a "dark secret"?
(Source: Renta!)
Note: Includes 2 extra chapters.