Of course

"Zatanna what it's like? To have tits like that?" She begged.

"They are beyond belief, pure perfection Kara. Everyone sees you as nothing more than a slut, but you know that every single man and woman will want to bed you. Regardless of their sexual orientation before, and there is no greater feeling than to be the **** of thegreatest mas-" said Zatanna a sense of arousal in her voice.

"I'LL DO IT" screamed Supergirl cutting Zatanna off "I'll fuck, I'll fight, I'll serve. I'll do anything you want Master just GIVE ME PERFECT TITS"

The desperation in her voice made your cock as hard as diamond "fulfil her request Zatanna"

"s'lirgrepus ydob emoceb taht fo eht etamitlu tuls" chanted Zatanna. Immediately Supergirl's tits grew outward one last time (though still not quite as big as Zatanna's) while her costume changed in a few areas to reveal much more cleavage. In addition slight improvements could be seen in her curves and facial details.

"FUUCK that feeeels sooooo goood" moaned Supergirl, massaging her newly enhanced tits. Cum leaking out her suit, as her fingers dived into her cunt. But of course that wasn't good enough for you as you seized her and pushed her to the floor and pulled her uniform to the side to gain an opening for your dick.

"Wait do we really ne- OHHHH" she screamed as you finally pushed your cock into her virgin pussy. Kryptonian physiology certainly made the sensation tighter and the pressure on your manhood grew to fantastical heights. Of course despite your average seized dick Kara, like all of your super slaves, often thought of it as the most perfect one in the world. After all why should you change when everyone else could instead change their minds to your liking.

"FUCK" you shouted as you shot your cum into her and pulled out from within her. Zatanna as was the usual case cast your dick hard as Supergirl writhed with ecstasy on the floor. Eventually she crawled up, a huge seductive smile on her face, while on her knees she pushed her tits together and asked in her most sultry voice "is there anything more I can do for you master?"

You walk up to her and start to massage her tits "between me and the order Kara your name is not Supergirl is it?"

"It's whatever you say master" she moaned, eyes closed embracing your groping.

"In truth it's Supertits isn't it, after all the love you have for those breasts it makes right" you say squeezing her nipples which had been programmed to be breast orgasmic.

"OH YESS MASTER PLEASE DON'T STOP. MY NAME IS SUPERTITS, I'M YOUR ****, YOUR FUCK DOLL, YOUR PERSONAL SLUT. I'M NOTHING BUT WHAT YOU MAKE ME AND THAT'S PERRRFECT" she screamed before blacking out in ecstasy. As you cummed again over her tits while she slept you wandered who'd be your next target.