Chibi Pire! ~Kyuuketsu Shimai to Ecchi de Bitch na Dousei Seikatsu~
Original title: ちびパイア！ ～吸血姉妹とエッチでビッチな同棲性活～
Yuusuke is an ordinary convenience store clerk. Ordinary except that he's a huge lolicon. After work he finds Lily, a little girl with wings on her back passed out in the alley behind his work. She hits all of his strike zones, a perfect loli body. Fearful yet not willing to pass up the chance he picks her up and rushes home.
Seeing her on his bed he can't control himself against such a perfect little girl and he rapes her. But she enjoys it! Even more her younger sister Lycoris comes searching for her sister Lily. Soon, he has sex with them both!