twin succubus sisters fight against each other to get their stepbrother's sperm.
well, you know.. the usual family friendly stuff.
and yes the author also made hentai doujin

The twins, Oona and Hooru, are girls who come to the house of Takeuchi Kou, a super-skilled JAV Actor. They looks like a normal girls but they're actually not. In fact, they are succubus who devours human sexual desire. The reason they are in Takeuchi's house is to be with their beloved Takeuchi Kou. However, the succubus can't fall in love with a human because of their species barrier. In order to make this possible, there was a way for a succubus to become a human. That is... To collect "Kintama" that can be obtained through no nuts for a day. In order to get the "Kintama", they pull each other's legs, make each other come, and interfere with each other, and the no horny survival battle begins

A story about a married couple who've abstained from sex until their wedding night. But on their wedding night, the wife turns into a little girl.

But that doesn't stop her from wanting children.

Nightmare is the Branch Chief of a certain evil organization, however, she has a secret that she can't show to her subordinates, a room where she slacks off after works using various healing items. A refreshing comedy full of healthy information!

Akito wants the stereotypical isekai experience and so he summons himself to another world, however things don't quite go as planned. He's the same unskilled loser that he was before. He can barely scrape together enough money to eat. One day a cute girl approaches him with a contract to join her party. He can't read what it says, but ends up being forced to sign it anyway. What's the worst that could happen?