Sister Harem -The Special Weapon Under the Maid's Skirt-

Kazuki has a secret he can't tell anyone... he's in love with his younger sister, Reina! When he comes across an online ad for the Nurture Sex Doll, he thinks his problems are solved when he buys one. After a month of loving the doll, she transforms into a real girl he can have all the sex he wants with! Comedic tragedy strikes as Kazuki is about to enter seventh heaven and his real sister chooses that moment to come for an unexpected visit! Fortunately, not all hope is lost, as suddenly the two sweet girls are both ready to please him. The only problem is, which girl is going to satisfy his carnal desires the most?