you raise your Alpha XL pumkaboo and feed her lots of fertilizer, in an effort to help her "grow up right"
She is a bit of a spoiled lap-mon, you can't say no to her and she's always cuddling against you, greedy for your touch
She evolves and now you have a 7.5 foot tall snugglestarved gord aggressively planting and grinding her fat ass that is more than three times as wide as your hips into your crotch constantly
and she's way too big and heavy to push off, so good luck trying to get anything done in a timely manner

Overnight, your cute, candy-scented cuddle bug had transformed into this towering fertility goddess with hips so wide you couldn’t even bend your arms if you hugged her widest point.
And her personality…before, she was a good girl! Maybe a bit spoiled, but so what?
She would coo innocently up at you from your lap, as you stroked the tuft of hair fluff.
Sometimes she would get annoyed and nip at your fingers if your attention (or hands!) wandered away from her head whenever she planted herself on her favorite "throne".
But now? She looked down at you with her glowing, half lidded bedroom eyes whenever she trapped you underneath her massive, crushing bulk.
She would bring a hair-hand up in mock surprise, covering her mouth as she playfully giggled, feeling you squirm ineffectually against her plush rear
Her twisting torso meant that she would constantly “adjust” herself to get a better look at you beneath her
Leading to you being ground into the couch by “total accident”
The first time it happened though, you tried to hold out against her arousing attack for long as you could
Constantly reminding yourself about the relationship you had with your pokemon. 

For Arceus’ sake, you’ve raised her since she had hatched!
But you were a hot blooded trainer. And she had a titanic ass, designed to wring out every last drop of cum from whatever victim came her way. 

Even you had a breaking point.
When your erection first throbbed between her jiggling cheeks, she looked down at you in surprise

And then, a downright horrifyingly smug and teasing grin broke out across her face
She redoubled the speed and effort she put into pounding you into the couch
Her aggressive twerking on your lap couldn't be anything but a sexually charged lapdance
All pretenses of innocence and plausible deniability were gone, she wanted to be coated with every shot of jizz you could muster
You didn't want to call your sweet angel "heavy", but the sheer size and girth of her wobbling rumpmeat meant that when she sat on your lap,
the top shelf of her ass was at your head level.
Meaning, your chest, thighs, and stomach were completely buried in her thicc boo-ty slamming against your body, hard enough to knock the wind out of you
You tried to tell her to stop, to push her off, and to go slower, but she just glared down at you.
With a desperate cry, she used Imprison
Instantly, your body went ridged
She cooed lovingly, and turned around on your lap so she could be face-to-face.
You felt her hair reach down your waistband as she nimbly started undoing your pants
She smugly stared into your eyes as she hotdogged you raw, her jiggling assflesh tightening and squeezing your oversensitive dick
Meanwhile, her hair-hands cupped your face, framing them before pulling you hard into a sweet kiss
Her larger size and your paralysis meant you were completely helpless as her long, dexterous tongue invaded your mouth
She kept agressively smooching you with saliva that tasted like a spiced late and hard candy, leaving you both panting for breath
The musky smell of damp autumn leaves and candlewax from her arousal started spreading through the room, as you could feel each other getting close
The jack-o'-lantern cutout on her front started glowing with a brighter and brighter glow as she somehow picked up the pace even faster
With a final frantic cry, her hair-arms pulled you into a bone crushing hug, as you felt her hips quake and spasm around your poor cock.
With a strangled yell into her chest, you unleashed rope after rope between her quaking cheeks
After you were completely spent, she floated off of you, before spinning around and spreading her asscheeks wide to show you the absolute monster of a load she coaxed from you.
Her hair hands pulled her gigantic cheeks apart, revealing her eager, winking, (glowing?) asshole and completely drenched pussy, coated in white rope after thick white rope.
A cider donut, glazed to perfection
She giggled at your drained and dazed reaction as the imprison finally wore off, giving you a loving kiss on the top of your head
Then mischievously pushed you down until you were laying on the ruined couch.
The last thought you had before her wide hips engulfed your face and she shoved her sugary, spiced pussy into your mouth was that you'd probably be here for a while.

Man that was fun I haven't written a green in a hot minute