Gimai-tachi to no Seikatsu wa Kimochi Ii Kedo Sukoshi Tsukareru

Yuuka, a young man, has begun living with his step-sisters Megumi and Natsumi. This marks the beginning of a tiring life. His step-sisters take Yuuka's lies seriously and try every trick in the book to get him to do something naughty. For some reason, his girlfriend Akane also encourages him, and before he knows it, he's sexually developing his step-sisters. The truth emerges from his lies, and he pushes them down!! How did it end up like this...?