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"Hermione," Harry said, as she turned sideways to look in the mirror from another angle, "have I got tits now?"
"Hm," Hermione said, not looking up from her book.
Harry waited, watching her girlfriend in the mirror, one brown foot tapping against the other as she concentrated. Harry spent the time between Hermione hearing her and processing the question to feel up her chest. Her nipples were more sensitive, and there was a swell of softness over her pecs which have always been scrawny, more likely to feel skeletal or sinewy than soft under a hand. There was a little squish of soft boob that compressed under her fingertips, that hadn't been there when they'd gone to bed.
"Harry?" Hermione asked, closing the book on her finger to show she was paying attention. "Oh, yes, so long as we make sure you're getting the right nutrition, you should be growing breasts any day now. We can tweak your potions regime, if we need to. I've been reading up on it, and I think shifting to a moonstone base will increase gender euphoria, as a magical chemical thing, not just as a response to internal perception and sociological phenomena."
"Stop thinking up experiments, Hermione, and come feel up my tits."
"Oh, Harry." Hermione's eyes dropped to Harry's bare breasts. Harry had bare breasts. She'd only ever had pecs before, in her good months, and a slightly sunken chest on the bad ones.
Hermione felt around on the bed covers until she found her bookmark, not looking away from Harry. As soon as her place was saved, and the book was on the bedside table stack, safe from the imminent threat of sexual activity, she jumped out of bed to get her hands on Harry's new tits.
Hermione was able to shift focus with marvellous speed, when properly motivated.
She looked Harry up and down, even as she didn't take her hand off Harry's skin, fingertips just stroking along Harry's collarbone, thumb over her nipple.
"Your areola is swollen as well," she announced, like she was reporting her findings for Harry to note down for her.
Harry nodded, looking down at her own body with fascination. The way Hermione was flicking her thumb across Harry's nipple was familiar, casual, circling around it the same way she sometimes palmed Harry's soft cock while reading, her thumb circling the head as though she hadn't noticed what she was doing.
Hermione bit her lip in that way which McGonagall, if she'd been more attentive, would have known preceded Hermione being the ringleader of mischief.
"If my tits were this size, just a little mosquito bite, they'd be just the right size for you to fuck."
Hermione said fuck in her precise, clipped accent, and Harry's eyes dropped shut. She was suddenly warm and wet and flushed, memories of the existential confusion of Gryffindors and Puffs mocking her tiny prick in the boy's bathrooms dropping away under Hermione's 'I have a thesis to test' expression.
Harry's cock was suddenly aching, hard, engorged to the size of Hermione's pinky finger.
Hermione sucked at Harry's new breast for a moment, the whole thing disappearing into her mouth like some fancy gala morsel, eaten in one bite. Then she dropped to her knees, yanking her t-shirt over her head in one move, which tugged her pink silk bonnet askew so a few curls bounced free.
"I don't know why anyone bothered to pretend you were a boy. Look at this little prick."
She curled a finger around Harry's cock, like she was measuring it for potions ingredients and finding it low quality. Harry shivered, slipping her finger through one of Hermione's tight curls falling near her forehead. Her prick might fit just as neatly into the curl as her finger did.
"I don't know either."
Hermione nodded, and then enveloped Harry's firm little prick between her breasts. They were full and lush, ("my nipples haven't pointed up since I was eleven," Hermione once said), and when she squeezed them around Harry's little cock it disappeared entirely, surrounded and swallowed by heavy breasts. Looking down at her Harry could only see the silky pink bonnet, the curve of her cheek, and the shape of her breasts pressed against Harry's groin, enveloping everything, not moving.
"Hermione," Harry gasped.
"Hmm," Hermione murmured, as she laid kisses on her belly, which was fuller than it used to be, curving and feminine. "Did you lose something?"
Harry laughed, which made her belly jump, which made Hermione's breasts move, which made her cock twitch, still buried and unseen.
"Only my goddamned mind."
Hermione hummed, getting her arms around Harry's arse to pull her closer. Just sensation everywhere. Warmth and joy and Hermione's hair tickling the inside of Harry's wrist.
"You should have kept better track of that, instead of relying on your girlfriend for homework help."
Harry laughed so hard she had to drop to the floor to hug Hermione, showering kisses all over her face.
"I've got tits!"
Hermione smiled, pulling Harry into her lap, cradling her in her arms, one hand groping Harry's new tits, the other cupping Harry's cock and balls in that infuriatingly casual way she had.
"And a girl's little prick."