Feeding.
There's many creatures that must feed just like humans. However, not all of them are the same. Some require more blood, flesh, and energy. While a human may eat a meal and the vegetables or meat they consume don't feel anything, a creature of the night creates a space for that. Feeding is sometimes a ritual or dance. The one feeding and the one being comsumed enter a space crafted for both of them.
Devouring: The Vampire.
A Vampire's bite might hurt initially when they decide to sink their fangs into their victims. Though they have a sort of poison to their saliva, quickly numbing the area they've bitten and making it pleasurable. It can sometimes make the process more enjoyable and euphoric to the one being bitten. While not as intense as a Siren's bite, they still have a sense of need from the one being bitten to continue feeding the Vampire. Though the strongwilled can easily break from this. This venom can also be used in other areas to sooth skin and create a euphoric feeling. Vampire's saliva has been known to be used as an aphrodisiac. For those who find intimacy harder might seek out this substance or a Vampire to fulfill those needs. For a Vampire, the feeding becomes a need. They savor the taste of the one that they're biting. It's a pleasurable experience for the Vampire. Though it might not be as euphoric for them as the one they're biting, sometimes it can make them almost drunk on the taste. Newer Vampires struggle with control due to this effect. The feeling is the only thing they can think about. Without the ability to get drunk or affected by substances, blood is the closest thing they can get to it. The older a Vampire grows, the more their taste grows with them. Making it harder to get that feeling of bliss so they might have to resort to more intense measures. Blood of other Vampires or creatures can be consumed but often seen as taboo. The older someone is, the more fine their blood can taste. Like a fine wine compared to a box wine.
Consuming: The Siren.
A Siren's bite can be far more dangerous than a Vampire's. The feeling of pain can swiftly be replaced by a feeling of lust and desire. Driving the one bitten into an intoxicated feeling of lust and love for the Siren they're feeding. It is more dangerous to let a Siren sink their fangs into you because you often won't want them to let go. The bite confuses and fuddles the mind of the one being bitten to think that they need the Siren to do this. For the Siren a bite causes similar effects, though not as strong. It can make a Siren extremely clingy toward the one they bite. They think about their blood often and can't help but want more. The blood can cause a Siren to feel a higher sense of euphoria and need than they would during intimate acts. It makes those acts far more intimate and intense for both the Siren and the one they're feeding on.
Savoring: The Demon.
A Demon doesn't feed on blood like a Siren or Vampire does. They feed off energy. They can get this energy by simply sitting still or doing various acts. Sometimes through the lips, sometimes by touch, or simply sitting in the same space of the one they wish to feed off of. The one they're feeding on feels a more intensity of those emotions. Passion turns to lust. Hunger turns to starvation. Anger turns to rage. Sadness turns to sorrow. You might not know you're being fed on unless you can separate those emotions. Feeding leaves the one being fed on tired and can sometimes lead to an all consuming death if not careful. Sometimes even locking them in that emotion for the rest of their lives. For the Demon, the feeding can be blissful. Most Demons feel the emotions they're feeding on. Some prefer feeding on the feeling of love or lust or joy rather than negative emotions. While others like those negative feelings to fuel their energy. The stronger the emotion, the stronger the Demon can become. If they feed on beings older than humans or creatures that hold more energy it can become hard for a Demon to stop feeding on them. It creates an almost endless well for them to siphon from. All depending on what the Demon wants and how hungry they are.
Wolfing: The Shape-Shifter.
The Shape-Shifter is a strange creature. It feeds off the soul of someone. Sometimes it even leads to consuming the flesh of their victim. A need to take every part of the one they're feeding on. They want to absorb every form of their victim. When they feed the one they're feeding on can feel numbness as they drink up the soul from their lips. A small amount of smoke-like substance passes from the victim's lips to the Shape-Shifter's. Depending on the aura and soul of the victim determines the color of the smoke. Some souls can taste more sour while others are sweeter. Shape-Shifters like to play with those they're feeding on as a sort of taste test. Some prefer the taste of fear, others the taste of love. It all depends on the victim. And once a soul has been consumed the flesh becomes the next target. Something they can't feel as they are now a shell. For the Shape-Shifter feeding can become a satisfying thing. Sometimes it can become more intimate depending on how they're feeding and how the soul tastes. For the most part it's satiating. Depending on how strong the soul is and how much feeling they give the Shape-Shifter, the need to continue feeding becomes physical. They can become animalistic once they've emptied the body of its soul. The need to consume every last piece of their victim becomes a necessity. As if they can't let a single lick of their plate go to waste.