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He makes himself smaller first. Not a lot, just so there's absolutely no resistance as he slides his cock inside me.
We're almost the same height now, he doesn't have to bend at all to kiss me, but that changes as Scott grows to his normal size. Now he's a little taller, a little heavier as he lays on top of me, looking at me with those beautiful eyes and slowly beginning to move.
His thrusts are gentle, passionate, like always. But the idea of what we are going to do is making my pussy ache for more, and I arch my hips up to meet him, desperately trying to get more friction.
"Ready?" he whispers against my lips.
"Yes."
As he grows taller, I have to crane my neck to kiss him. He's stretching my pussy exquisitely, his cock now at the upper limits of natural human dimensions, and his tongue takes advantage of the way my mouth falls open in pleasure.
Scott moans into my mouth, thrusting slow but hard and hitting bottom every time.
I've never felt so full, so perfectly stretched. It might hurt if he wasn't being careful, but he's taking his time, almost excruciatingly so, sliding his enormous cock inch by glorious inch until he's completely in, then slowly dragging out and starting again.
Sometimes he rolls his hips, and smirks at my sharp intake of breath when his pelvis grinds against my clit just right.
"You like that?" he teases, pushing in a little harder and doing it again.
"Yes!" I gasp, digging my nails into his arms as Scott starts going a little faster.
"You know Hank is going to be mad if he finds out that we are using Pym particles like this," he says with a low groan as my pussy involuntarily clenches at the thought. "Wait, why do you like that?"
I blush. It's totally illogical. He's my boyfriend. He's currently got nearly a foot of cock inside my body. I shouldn't be embarrassed.
"Maybe I want him to punish me," I say shyly, and Scott's face lights up.
In an instant, he's rolled both of us over, my face resting on his chest and one arm around me. His other hand rests on my ass, caressing and squeezing as he thrusts upward into me.
"Naughty girl wants to be spanked?" Scott asks, but we never get around to answering that question.
He must have hit something by accident when he moved. His hand grows larger, encompassing my entire ass, my face ends up closer to his stomach as his body gets taller.
And his cock…
It's beyond anything humanly possible. I can't see it, but boy I can feel it, and if it's in proportion to the rest of him it must be almost as thick as a champagne bottle.
"Oh my God," Scott says, his voice strained and on the verge of orgasm. "Are you all right?"
"Yes," I whisper against his abdomen.
It's uncomfortable, but I trust him more than anything and he makes me wet just looking at him, so my body is gradually relaxing around him, adjusting to the size.
Desperate for friction, I grind my hips against him, working my already excited clit into a frenzy. He gets the idea and slowly, too slowly, resumes his thrusting.
Every nerve ending is on delicious fire as he picks up the pace just enough to make my body start to tighten. The head of his cock hits my cervix as gently as he can, but he is still practically splitting me in half with every thrust. I wonder how many inches he can't even fit inside.
I wonder how much bigger I can take.
But then I am climaxing, screaming his name into his skin and squeezing around him so hard he seems like he forgets how to breathe for a moment.
He shrinks himself before he cums in me, and I'm thankful because I can't imagine how big of a mess it would be otherwise, and we lay there for a long moment, holding each other and remembering how to breathe.
"Next time," Scott says softly, "do you want to be the big one?"