On the one hand, you kind of are making yourself a lie of sorts, which is unethical.

On the other hand, presumably the magic is permanent and that’s just the new you, forever, so it’s not a lie. You’ve just changed your personality to fit their desire/needs.

So much in the way that Aladdin became a prince via phenomenal cosmic power, he really was a prince and not a fake prince, and therefore never really lied to jasmine about that (he just about literally any part of his past as a prince, since he wasn’t until yesterday), because genie magic isnt some cheap parlor trick.

So yeah, as long as you are the one permanently changing and you don’t lie about it then I guess that’s okay with me.