Extreme obesity

For us it's just sort of emerged as a practical difference in our bodies.

I could never get as fat as her, my heart's too weak and I would literally die before I could enjoy my new life. She has the opposite condition, she keeps getting bigger and bigger no matter what, with no problem. So now I need to hold myself against the furniture just to get her out of bed, she 's so huge!

Totally agree on all levels. The difference in size and form between my body and theirs is an inexplicable turn-on for both of us. Without the difference, we can't both appreciate just how massive her proportions have become. It's blissful.

Size contrast is my favorite. My partner is short and fat, while I’m skinny and towards the taller height

Yeah!

She's a head shorter than me, and almost 200 pounds heavier!

Very nice, mine is chest high and 70 lbs heavier

I'm a guy who's very short (5'3) and while I appreciate all expressions of feminine beauty, I have typically been attracted to women who's appearance is in complete contrast to my own. I usually went for slim women who were much taller than me. EX. 6,0 to my 5'3.
Even though, they may have no interest in dating someone who was simply much shorter and rounded, I couldn't help enjoying the contrast.

In my fantasy mistress must be thin and tall, and her girls slaves/servants are tiny (155-160 cm)

Another option is pair of woman, one “model” that humiliates me, other encourages by increasing her hourglass shape.

Love it. I was once the skinny side of it when my ex put on about 150 lbs. Now I think I'd like to try finding a tiny girl to envelope in my fat. Of course she might have to work to fatten me a little more to get there.

I agree 100% the contrast is so hot 🤩
I really love they way you put it, the 2 extremes of the human body 🤩

My wife and I have experienced body contrast from both sides - when we met many years ago she was the BBW and I was the fit guy. Then things changed and now I am the SSBHM and she is an athlete. I feel so fortunate to have experienced both with the same person.