Man she really struck gold, she would've just been used and possibly passed around with her mindset if she didn't run into her current boyfriend first.
Well becoming fit very often pairs with becoming more and more self-confident and feeling like you better fit in your skin. That along with the physical changes would probably affect how you're treated by people. So honestly aside from the crazy bitch, the logic isn't all that thin
"Reverse rape" isn't a thing, it'd just be rape aswell.
And by definition since this guy wanted to, probably enough to thank all deities in any universe for this, it doesn't qualify as rape.
They got the memories, same personality, same soul, same ish looks, why not the abilities tied to them aswell? Considering it all seems a bit spiritual i assume their abilities are tied to their souls, not their bodies.