I'd like to role play changing places with or changing me into a bbw or ssbbw. Can involve pregnancy. Will RP with gals or guys.

I know of a chubby lesbian & a fat bi woman who got married. The chubby gal has since gained weight, & the fat one had to undergo surgery to lose weight, butt is still the heavier one.

When I was a current member of NAAFA; the commonly quoted % of FAs was 10. I don't remember the justification for it, sorry.

Would be quite interesting to be a very fat person of the opposite gender.

I'm a B

Nope, I wouldn't recommend it. Although she was gaining about 12 pounds a month & you only want to try to do half of that.

A gal I knew, got badly dumped by her bf, causing her to go in a bad depression & went from 170 to 280 in just 9 months(no pregnancy).

Could you give more detail?

Yes, having a fat gal fatten me until I fit into her clothes & then beyond.

Very nice fantasy.