Wagaya no Tonari ni Sumu *Gakusei ga Konna ni Bitch na Wake ga Nai

The protagonist dies as a result of a goddess's mistake, and spends 4 days inside the body of the cute little girl next door until he can be reincarnated. But that girl turns out to be a sex freak. She has sex with her brother, plays with a vibrator, sleeps with her teacher, shoves a flute up her p*ssy, has anal sex, even sleeps with Daddy and takes two d*cks at once. A 4-day erotic movie about supernatural transgender incest.

[From DLsite English]