Some of it will depend on how you want to engage with the force feeding kink and/or BDSM. You can have much more comfortable positions, like being on your back propped up by pillows, if you aren't worried so much by physical restraint and domination, instead relying on verbal "coersion" or "punishment/reward" play.
Remember that force feeding doesn't just have to be about having your face pushed into food so you have no choice other than to eat--it's about entering a headspace where you give your partner control of how much you eat. The method is secondary to that.
For more specific advice, consider some foods like popcorn, pork rinds, or rice if you don't want to use cake for your face-in-food style sessions.
You can also try funnel-feeding if you haven't already; shakes and smoothies are incredibly filling, and you can be lightly tied to the headboard of your bed to give your partner control over how much you drink.
Remember that force feeding doesn't just have to be about having your face pushed into food so you have no choice other than to eat--it's about entering a headspace where you give your partner control of how much you eat. The method is secondary to that.
For more specific advice, consider some foods like popcorn, pork rinds, or rice if you don't want to use cake for your face-in-food style sessions.
You can also try funnel-feeding if you haven't already; shakes and smoothies are incredibly filling, and you can be lightly tied to the headboard of your bed to give your partner control over how much you drink.
7 months