AneOne: Three-way Swap

Imagine a love triangle made of one-sided crushes: the boy likes his neighbour, but she’s a lesbian who’s in love with his sister, who’s in turn in love with the boy. Now add a magical app that causes them to swap bodies and makes them all more sensitive and horny as a bonus. What you get is 1) absolute chaos, 2) sexy hijinks all around and 3) the premise of this full color doujin.