Fattening others

Stuff to do with my girlfriend

My girlfriend is well aware I’m into feederism but does not want to shape her own body in any way for me (I don’t want her to either). She enjoys dipping her toes into my fetish to please me, but that’s it. Actually every now and then we do what’s called a “munching day” where I buy a ton of food for us to stuff ourselves with all day. She’s takes the step further and asks for more than usual. She lets me kiss her belly, listen to gurgles, rub her belly, and that’s about it, it’s all incredibly adorable.
Does anyone know of any incredibly passive activities I can do with her that would not permanently change her body, but something that we could bond over that she can enjoy and have fun with? (She has a vomiting phobia)
3 years