[VergeOfDiscovery]

Re: if I can keep my muscle mass and possibly grow a booty and smallish boobs from it

Ainterol's Pueraria Mirifica Cream, perhaps. One could apply it to the areas one is interested in seeing potential changes.

When using the cream and lifting light weights, even "smallish boobs" may be amplified by a more puffed out chest from the weight training.

As for a better butt, there are some good videos on YouTube for that (exercises).