The question is does he free what is already there or does he create something new? To me he frees something that is in principle already there, but due to his panic and lack of control removes possibly way too much of her inhibitions. Not sure if you have had the scene with the aunt where she gives you a handjob, what she tells is very informative though.
It is not like he is constantly controlling her or tells her what she should do. She basically does those things out of her own will, though mc is guilty of freeing that will and it seems to be corrupting him some and may well lead to unforeseen consequences especially since he is not really in control. Looks more like Megan is overall, just a Megan with very few inhibitions left.