Memory replacing

I like stories when mental powers are somewhat limited... One when mind controller's only ability was to replace last few hours of memory with anything he wants...

In that way it is possible to put a memory of hot sex to girl's mind, to make her ready for more. Or **** and blame someone else... or many other possibilities...

Long-term memory replacing something I'd avoid, as this allows dramatic personality changes and that's too overpowered to my tastes