Once again to answer your questions you can't pick and choose where the fat will accumulate.
All of that is driven by your genetics which means you have no control over where the fat will go.

Balanced out is always good.
My BF has a fat butt and love handles.
His belly has grown a bit lately and its too cute.
He is 350 ish .
I love when our fat touches I get all tingly inside. Clothes or no clothes it makes no difference.
His hugs just make me melt.

There are no magic tips or tricks that will make fat appear exactly where you want it to accumulate that is governed by your genetics.

Heavy cream will make you softer first then the weight appears slowly.
It always made me gain.

Why not move up to something stronger than waste more money on another futon?

You don't get to choose where the fat goes.
That hinges on your genetics.
As for me I just ate more of the things I liked.
Occasionally did stuffings ate lots of ice cream as well.
It took years to gain weight so don't expect to get fat in a few months.

Make my BF go get me more food at the buffet because I was too stuffed to move plus my belly was in view because the elastic waistband on my skirt had rolled down and wouldn't stay up.

Heavy cream always made me gain but you can use meal supplements like Ensure as well, it does about the same.
Drink what you can handle and there is no need to drink a lot because your body can only absorb so much.
It does have a residual gaining effect on me and I will gain several lbs even after stopping.
Mass gainer shakes do the same on me as well.

My BF of course the first time our fat bulges touched it was magical.

Underwear is a constant struggle for me.
I think elastic has gotten worse over the years.
Never seemed to ever wear out now after a few washings and they seem to lose strength.