Extreme obesity

Well in the context of one's fantasies I'd say there's almost no limit. However, if we're talking realistically then I'd say that struggling to walk/trouble breathing or abnormal heartbeat is for me the limit. I would want my girlfriend to be happy with me in a relationship, not use her body for my own lustful desires.

For me, I would guess somewhere in the 500s is where I'd have to be sitting most of the time. 600s for not doing housework, even occasionally. So I'd say somewhere in there.

I would love to be fattened like this while being sleepy, relaxed, lazy, not caring with big appetite & slow metabolism. Not forgetting being little turned on while my belly would be stuffed & growing rounder. Not forgetting moobs getting heavier, rounder as well.

I would love to find female feeder who would keep me on this kind of mental stage. Especially if she would secrectly drug me with medicines that would cause this.

I thought I could stop at 600lbs and now I'm living in a bed.
As long as I am able to eat and they feed me. I will continue to gain weight and I will never become too fat.
You can always be too obese and still continue to gain weight.
With all this food in front of my face, there is no way I can stop gaining weight or try to reverse my situation.

If I could maintain basic mobility and health, I'd gain another 150 pounds (currently 573). I only stopped because of a medical crisis and surgery. I've been a hardcore belly stuffer for years, and not a day passes that I don't wish I could eat my way into oblivion.

It all depends on the person

We keep escalating. Started out as me being like "immobile is a fun fantasy but sad IRL" and her being like "I'm not fat, I'm curvy!"

Now we're at the stage were I'm like "I'm gonna get you too fat to walk and have to roll you out in a cart for dates so everyone can stare!" and she's like "I'll let you do it so I can boss you around because I'm so fat and helpless!"