Well, a lady doesn't change someone's fundamental structure and tell... But really it depends on the person! I find transformation most appealing when it's related to something that's already in someone's personality. Either accentuating or reversal, like turning a sweet submissive who's already begging for you to sit on them all the time into a literal chair so you can stop worrying about things like "Can she breathe down there, it's been a few hours now." or on the other end of the spectrum taking someone who's shy and reserved and giving them a big attention grabbing body that they can't help but be proud of and show off.

As for why they aren't you... mostly because I don't know you well enough! How am I meant to know what changes to make if I'm just using accquaintance level observations!