help me find this pls

i’m looking for a BL smut manhwa oneshot (part of an anthology i think)
- full color, very short (3–5 chapters)
- read on MangaGo
what I remember:
- uke is an incubus who refuses to feed, so he becomes weak and sleeps all the time
- he lives in the demon world with an older butler
- the butler teleports the seme to the demon world, they have kind of a contract, where the seme have to sleep with the uke and in exchange the butler will make he's cat be healthy again
- the seme is gentle and he ejaculates so much that one of his past partners ended up in the hospital because of it (idk if thats why the butler made a contract with him, but it has something about he having so much vitality)
- seme: black hair, blue eyes
- uke: darker skin, light hair, i dont remember the color of the eyes, small horns and a tail
- uke starts with a buzz cut, transforms into a powerful demon with long hair (for a really short time) and then returns to a buzz cut
scenes:
- the uke’s tail moves on its own, checks the seme, and wakes him
- the uke resists sex while his body reacts automatically
- the seme is really gentle and sweet with the uke, and really calm about the whole situation
- ending: seme returns to the human world, and after some months the uke go to the human world too, they reunite, have sex, and there’s a scene with the uke and the seme cat lying together (thats the last scene i think)

anyone recognize this??