Prompt: M'gann works out how to shape shift into male forms after some time honing her skills. Superboy is suddenly a lot more interested in her.
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Earth Boys for Dummies
The night that Superboy almost kisses her changes things. Superboy drops by at least once a day between training and brooding and playing tag with the Ball to say 'hi' and check in on her. The amount of time he spends brooding starts to lessen, replaced with watching TV together and flying together and cooking together. He looks happier than he has... well, ever.
So M'gann is happy. Really. Well, mostly.
See, once of the few times she'd spent time alone with Robin, the conversation had inevitably turned to Wally's flirting, and Robin had casually mentioned that sex is pretty much the only thing teenage earth-boys think about.
So it's a little distressing that although Superboy spends nearly all day with her – alone with her – and smiles at her and nearly kisses her once or twice (and does kiss her once, and it's the most amazing feeling ever)... sex just... never comes up.
Maybe it's because he's Kryptonian. Maybe it's because she's a Martian. (Maybe, her mind whispers at night, it's because she's not nearly so pretty as Wally says.)
She's familiar with the concept of being attracted to someone emotionally without being attracted to them physically. Maybe he's just not interested in her body – and although she can understand that, it's... a little distressing.
She isn't quite able to decide who to go to for advice, much less work up the courage to do so, before the situation resolves itself.
Her uncle tells her to keep practicing turning into males, so she does, while Superboy is off training in the gym. She flattens her earth-girl breasts – flat, curved, flat, curved, flat – and increases her height – tall, short, tall – and increases the width of her shoulders – wide, slim, wide, slim – and then tries them all together, and... she returns to her usual earth-girl appearance with a shake of her head. Too wide shoulders, not enough height and her face didn't look right without earth-girl breasts. The beard didn't help either.
So she spends a few hours on the internet looking at earth-boy anatomy and staring at faces, before she goes back to practicing, feeling like she'll never master it. She hasn't even attempted a penis yet.
Finally, she thinks she's got it. Shifting one part of her body at a time – slowly, and holding on to each piece as she achieves the look she wants– she gives herself a wider jaw, shorter hair, a hint of stubble, a flat chest. She increases her height and the breadth of her shoulders, and narrows her hips, and –
She yelps, and nearly loses it at the sound of her own voice, at the sight of Superboy, watching her through the mirror.
His expression looks like Wally's, back when he'd first seen her. Awestruck, and wanting.
Oh. Oh! She thinks. Is that what the problem was?
And Superboy flushes.