Many generations ago, the main characters in this story, a brother and his two sisters, had demon ancestors mixing their blood with theirs. Think succubus, incubus, and the like: sex demons. The present-era result is a family in which sex drive and endurance go way off the charts and in which incest is perfectly okay, woot!
One chapter later, a girlfriend joins, she’s just a normal human but her sex drive and competition spirit will make up for her initial disadvantage, leading to a successful harem conclusion
We’ve got splendid drawings reminding me of early Homunculus, lots of beautiful idiosyncrasies all around, enthusiastic sex, great butts and nice breasts, look, the only thing to suck is the whiteout censorship, everything else is excellent, enjoy! ^__^
Thanks a LOT to Mikakunin for this one!