It's absurdly simple, really:

• Start going on walks with your 2 ton steel type

• Find the finest railroad ties for her to eat

• Keep buying bigger sizes of her favorite clothes (remove the size stickers if possible or sew smaller size ones on)

• Keep telling her she can't be gaining weight since she regularly gets cardio (which doesn't burn much fat, but she doesn't know that)

• Watch her wobble around, her swelling rolls devouring every railing she leans against and her bulk cracking benches. She'll do that blush and get all flustered and you get to tell her she's fine and hug her and she's so warm and soft but also strong and you sink in like she's a big pillow ghslkdfahjkllfaklsjl;akla;g

As per usual, workflow here.

I literally threw in a test prompt after doing the last pic and got this visibly mommy-shaped tin can, I'm cracked.

This was made with ChromaXL v3.31 Spud, check the previous image for more info on how to make it not shit itself when you try to do basic things.

Proompt:

solo, anthro, (obese), mature female, (aggron:0.9), black body, blue eyes, slit pupils, black sclera, yellow shirt, blue jeans, (mom jeans, high waisted bottomwear:1.3), denim, standing, arm support, looking at viewer, tired, smile
BREAK
(stocky), (fat arms:0.8), huge breasts, bloated, round belly, huge butt, (huge thighs),
three-quarter portrait, three-quarter view, outdoors, detailed background,
BREAK
[odisia, cettus : bellylliumu, erumeruta, radiowave, cosith : 0.4],
dark fantasy, unreal engine 5, raytracing, best quality
<lora:SyMix_Pony_v08a07_ND01:0.8>

Negative Proompt:

abs, navel, slim, belly overhang, (fat rolls), ribs, scales, armband, shoulder spikes,
worst quality, source filmmaker, pixilated, grainy, outline, sketch, flat color, patreon, watermark, worst quality