Ore no Megami-sama!

One day, Yuya starts to live at his uncle's house alone. But two weeks later, a goddess appears in front of him. Her name is Rean, and she comes to his place to be his wife following the god's order. He thinks it must be a dream, and orders her to give him a blow job. On the next day, when he wakes up, there is still Rean in the bed together with him. Aira, Rean's older sister, and Cachua, Rean's younger sister, also come to his place, and they start to live together.... Yukiko, his girlfriend, gets furious to hear that, and starts to live at his place as well....