>>8591071

This isn't a hentai doujin but a romcom manga called Majime Succubus Hiiragi-san, or Serious Succubus Hiiragi-san, but it's about a story about an office worker who otherwise swore off love falling in love with a coworker, but who turns out to be a succubus that basically have their own office culture and now she wants his bodily fluids. It's 34 chapters and it's been concluded as a manga, I believe, so I recommend checking it out.