-According to the Pokedex in Pokemon Sun:

"Its milk is high in calories and packed with nutrients. Therefore, if you drink too much of it, you may wind up with a body like Miltank's."

The unfortunate trainer knew this from her dex, but she just figured it meant her body would get a little bit fat. No biggie! She runs around a lot. She's a Pokemon Trainer, after all! She would just drink in moderation.

And yet, that barman in the Pokemon Center just kept encouraging her again, and again, and again! "Miltank milk is good for people!" "The milk will make you strong!" "The milk this, the milk that, the milk! Drink it!"

While he got rich off of his shady dealings, the trainer just got fatter...and fatter --with a body like Miltank's. Literally!

At least now the barman has a boost to his milk supply... he'll put her where he put the rest of his loyal customers~

---

-He heard many young trainers have been disappearing from the Pokemon Centers lately... but little did he suspect it was due to the very milk he was drinking as he thought about it that was the cause.

"Just one sip and you'll be hooked." the barman said, as the trainer shrugged in his mind, the milk was alright I guess.

"The milk is so mellow, yet rich, that it'll make you wish your mother were a Miltank." he added.

Oohhhkay. it's not that great. The trainer thought, a little creeped out, as he rolling his eyes. Still, it wasn't bad.

In fact the more he tasted it, the better it was... and so drink and drink he did, the man handing him one bottle after another... it was too late, by the time he realized it, fat, bloated, on the floor, a big bulge that his small hooves were stroking... a large pair of udders.

"I warned you~" the barman said, chuckling and opening the door to the back room where the trainer would join the rest of the trainers in restocking the milk supply...

---

Pokemon Sun/Moon encourages miltank TFs huh? On dA, these were two separate images and stories. I combined them into one here.

(Characters involved are 18+ at the time of this depiction. Character and monster/Miltank involved/trainer design belongs to their respective owners (Pokemon Company, Nintendo, etc etc etc))