General

She is always encouraging me to eat more. It's definitely shown up on me and she has been playfully pinching or poking my stomach and sides lately.

There are varying degrees within this fetish.

Also, there are people that sometimes find out they like a little extra on their significant other after seen it develop.

It’s hard to tell exactly, give us some more details, details and instances, and maybe we can figure out a bit further along

Not necessarily. For some people, feeding people is a love language. Also, she might be playfully teasing you. The best thing to do is ask her. Communication is key.