After a night of incredible sex with the girl who was once your brother, Ty goes to sleep. The next day he wakes up beside Mei, and they prepare to go to school.
At school everyone acts as if Mei was always Mei. Many of Dustin's friends are still Mei's friends, but they all recognize that Ty is her brother and they don't try anything with her. Ty pretends that it's a completely normal day and everything goes as expected, except Mei is now a cheerleader and of course she isn't in the same grade Dustin was in.
After a whole day and more sex, Ty changes Dustin back, and makes them both real brothers as long as he remains Dustin. But Ty is careful--he makes it so that Dustin doesn't mind having any of this happen to him.