Bodyswap. This will be fun.

Remilia won't care, and they'll be made to do the job of the other.

Meiling will abuse her new time stop powers, grow bored, and start doing chores to pass the time.

Sakuya will flex Meiling's bod, stand vigil for a couple days, before growing bored, and falling asleep.

Sakuya will be thrilled to have big tits, but then finds out that they get in the way.

God bless this artist, making Touhou 4komas for 15+ years.