Fattening others

I'd probably go all out on the feeding aspects. Diet control to promote subcutaneous fat over visceral fat, minimal exercise, pleasuring while eating to get some happy associations with food, and the occasional crash diet to break through plateaus and try to get a nice saggy deflated look. This of course assuming consent and taking health considerations. But yeah...I'd pull out all the stops to get her as big, jiggly, and saggy as possible.

I hope this person will make me magical fatter by the second, so i will explode out of my clothes and get trough all the stages of fatnes in a short time ending up extremly fat.

I would fatten them up to my liking, no matter how fat they become. Complete control over their diet and waistline