Setting: Furries (Anthropomorphic mammals, reptiles, avians, insects, mythological creatures, any type of animal really), and Synthetics (Protogens, Synths, and similar robotic equals to Furries) living together on a standard, Earth-equivalent planet. Some of the population has what are called "tailmaws", secondary mouths that are part of their tail, either naturally (It's a recessive gene), or they can get one through surgery if they're biological or modification if they're a Synthetic. Technology level is decently futuristic, but not multi-planetary. Main city setting is called Aethelgard.

Primary Info: Vore is relatively common due to people having reformation abilities and unique, vibrant flavors, and some people go far enough to use Merge Potions to temporarily (or permanently, though it's less common due to various reasons) merge people into their stomach or other applicable organs.

Prey Reformation: If a pred digests a prey, they can wake back up in their bed, fully restored whenever they want, or remain tethered to the person who digested them for as long as they want. A bit of the prey's weight does remain with the pred, however.

General Merge Potion Info: Usually sold as bottles, requires ID to purchase. The liquid is often pinkish in hue, and somewhere between water and honey in terms of thickness. Merge Potions come in a variety of durations, from one hour to a whole year. If you see a merged organ, it would be very clear who is currently merged with it, as the organ takes on the colors, patterns, and even a few physical traits of the prey if applicable. Merge Potions only really work for vore-related scenarios, and you can't exactly vore someone with your arm or leg.

Stomach Merge Potions: If a pred drinks it while prey is inside their stomach (or drinks it before swallowing them), the prey merges into the pred's stomach, and will experience every sensation relating to being a stomach, such as churning, grumbling, etc. Once the potion wears off, the prey will seep through the pred's body and harmlessly pop out near the navel of the pred, with whatever was in the merged stomach at the time of splitting being transferred to the prey's own stomach.

Other Merge Potions: Like the stomach ones, but for other vore-related parts, such as a proboscis, tailmaw, etc. Location the prey comes out of depends on the place they're merged into.

Perma-Merge Potions: Merge Potions that are permanent. Quite a bit more regulated than regular Merge Potions due to what they do.

Universal Merge Potions: Universal Merge Potions are heavily regulated, even moreso than Perma Merge Potions. They're capable of merging a Sym into any part of a Body, as long as the Sym's inside it, for as long as the Body desires... There's a black market for these things, too...

Culture around Merging: Merging is seen as rather intimate, similar to sex. It's often reserved for close relationships, as you literally become part of someone else. Though the act itself is intimate, it's seen as completely normal to show off merged people if so desired (as long as it's not indecent to do so), and even decorating them with removable accessories. Getting piercings on a merged part without their consent, however, is heavily looked down upon. Of course, as with most things that society considers intimate, there's nightlife establishments dedicated to the art, referred to as "Mergehalls". Vore using someone that's merged into you (ie, swallowing someone while having someone else as your stomach) is somewhat uncommon, but it's still something the people of Aethelgard do. The terms for Merge-related positions are Body for the one drinking the potion and absorbing the other, and Sym for the one turning into the other's organ.

Mergehall Info: In Mergehalls, the potions flow more so than water, and it's not uncommon to see one person leave for every two people that enter. Mergehalls never offer Perma-Merge, though, or anything longer-lasting than 3 hours, and ESPECIALLY no Universal, as they're more of a quick teaser rather than a committal service.

Additional Merge Info: Syms, while obviously unable to travel without the Body, can still move whatever part they're merged into, such as being able to move the end of a tail or proboscis as if it was their head, or produce an intentional churn as a stomach. Syms also don't affect the size of whatever they become part of, though they do add a fair bit of their mass. Syms can't talk when merged, but they can think inside the Body's mind. Merges don't affect the coloration of the Body, apart from the part of them the Sym is merged into, of course.