Male

There's a blinding flash of light and you find yourself standing on a sidewalk in a gleaming city, possibly Metropolis.

“You!” A woman shouts from above, drawing your attention.

You look up and see Supergirl floating above you with her hands on her hips, but she looks quite different from how she is normally depicted in the comics. The first thing you notice is her chest. The S-shield printed on her tight blue crop-top is distorted by a pair of gravity-defying 45DD supertits. The red cape attached to Supergirl's top isn't quite long enough to reach her waist. Her bare stomach sports a ridged set of 6-pack abs that you're sure could stop a truck all on their own. Her arms are packed with muscle while remaining very feminine. Her red miniskirt is so short that from this angle you can see her blue panties, even if she were standing on the ground it still wouldn't have enough coverage to fully cover her buns of steel. Supergirl's legs are also packed with muscle, her thighs bulging with Kryptonian power. Finally, her feet are clad in red calf-high boots.

“Me?” your respond, feigning innocence as gazing upon this vision of barely-clad power and beauty causes your cock to immediately stiffen in your pants.

“You're the one!” Supergirl responds as she gracefully floats down to land on the street in front of you. “I got a message Brainiac 5 sent from the 31st century. He said that today a man would appear in a flash of light and that I should avoid him at all costs because history records that the guy would defeat me and turn me into his sex ****. The picture he sent along with it looked exactly like you!”

“And yet here you are, doing exactly what your buddy from the future warned you not to do.” You reply with a smirk. “Maybe you WANT to be someone's sex ****? If you're offering, I'd be a fool to turn you down.”

“As if! Very few records from our time survived to the 31st century. A lot of info was lost or got garbled over the course of a millennium and future archeologists have about as much luck piecing things together then as they do now. There is no fate but what we make, and I'm gonna prove the 31st century archeologists wrong!”

You lick your lips at the thought of making Supergirl your bitch. The idea of taking down such an obviously powerful babe makes your already hard cock swell, the bulge in your pants becoming obvious even without X-ray vision. There are so many ways to take down a Kryptonian, both canonical and stuff made up by fans, and you're in control. First on the list is the old standby: Pull out a piece of Kryptonite and watch her crumple as her powers are drained by the little green rock, or maybe a different color depending on if you want just to weaken her or have a more exotic effect on the girl of steel. Or you could make her weak by squeezing the power out of her huge tits, making the symbols of her femininity and sexuality the means of her defeat. Or maybe she's weakened by sexual arousal itself, the hornier she gets, the weaker she gets, with an orgasm leaving her completely drained.

Another possibility is that you don't make Supergirl weaker, but instead make yourself strong enough to defeat her at her strongest, slamming the mighty Supergirl through buildings and then jackhammering her pussy hard enough to crack the pavement beneath her ass has a certain appeal. Finally there's the option of just taking away her powers outright, leaving her an ordinary girl in a skimpy outfit ripe for domination. And if any of these options don't do it for you, you can always come up with something yourself to put Supergirl in a submissive state.