I feel like stomachs in safe vore scenarios deserve to get weirder. Most of the time, people just make it a regular stomach that happens to have a large capacity, but why not expand on that? So, here are some ideas I can think of to demonstrate what I mean.
Magical preds could have stomachs that can change on a whim, whether that's based on the pred's desire or the prey's. If it's the pred's choice, they can use the stomach itself as a way to show that they care. If it's based on the prey's choice, you can guarantee the ultimate comfort.
Giant pred that doesn't actually need to eat, so their stomach is more of a holding space. Instead of rugae and peristalsis, they have voluntary control of the stomach and a fixed volume. You can have the prey and some personal comfort items for them, but then the stomach is full and everything else gets blocked out to avoid it getting cramped. This also makes hugging with the stomach easier.
Shadow creature pred with a stomach where the stomach and walls look like space, and they have so much give that you can barely even feel that the stomach is around you. It just feels like you're on a pile of cotton or something.
It's fun to be experimental, so why not try experimental stomachs, right?
Edit: Extra idea. Hot tub/sauna stomach. Instead of it just feeling hot, the actual functionality is to serve as a hot tub or sauna in order to provide relaxation.