Fat experiences

Yes.

I got aroused from my wife noticing my gaining...and in turn the thought of her liking my gaining.

And vise versa with her.

I simply get aroused by my wife's maintaining her 300+ pound figure these days

Life just keeps getting better and better when this happens.

I can't think of anything more arousing than knowing your spouse or partner gets turned on by your own fattening. I would probably completely give in to their desires and let them feed and fatten me to their hearts content. Just the thought of such a relationship turns me on like crazy. And if they got fat along with me, that would be even better. A mutual gaining relationship is so hot!