Similarly, soda can get you started. You might also try either warmth, like a heating pad or hot water bottle, or massage. Or both

Sweetie,

The only way to answer this is to figure out what you want. Do you like the idea of her feeding you? or gaining? Or do you get off on submitting enough not to care about the weight gain?

You have to find the answer to this one within you, I'm afraid. At least, that's my two bits.