If you feel its best not to reveal then don't.
Only you know your partner.

Joe no need to rush I suppose.
Lovesstuffing only you know your partner so I can see your point.
Its an interesting subject either way

I understand the embarrassment factor but maybe just say you know I have a "secret" then that might spark her interest as to what that secret is.
Then just come out and say it.
Its not like she is going to run away LOLOL

Wouldn't just telling them straight out your preference be simple enough?
No reason to try and think up some contrived story to try and justify asking.
Just be open and honest.
I would rather a guy or partner just be honest of their desires.
Are you slightly embarrassed to admit you like doing that? Is that what makes it hard for you to ask?

80lbs in a month???
I would like to see proof of that.

When I was actively gaining I constantly ended up going over my goal weight.
I didn't weigh myself all the time like some did and always ended up 5 or 10 lbs over the goal I had set.

No then I wouldn't be special LOL

That depends on if your body will have stretch marks as you gain. some get them some don't.
Usually a rapid gain will cause them.
I never got them myself and I'm obese.
I have cellulite in abundance but no stretch marks.

Everybody is different in how they carry their weight so there is no way we could say how much weight it will take.

Most of the guys I dated were in the 300 350 range.None gained or lost during the relationship.
I dated one guy who was very athletic and I got him to gain 20 lbs or so but he didn't like gaining on himself.
When we met I was 115 and when we split I was 250 ish.
He had no problem with me gaining and if it was what I wanted he was fine with it.