Help finding a smutty snake god manga

Yo! Basically I found this manga maybe a year ago and I can’t find it again. Shockingly there’s at least one other manga with a very similar premise!

Specifically it’s a darkish bl, where the protag is cursed by a snake spirit? He sees visions, he can’t sleep, and runs into a medium who offers to cure him- literally by fucking the evil energy out of him. Super crazy premise but it’s played totally seriously. They go to this mediums mountain estate, fuck for like a month, and it turns out the medium IS actually the snake spirit. There’s an epilogue chapter that shows the protag is a reincarnation of a tragic lover of the snake spirit.

I’m losing my mind! It was so good! But I can’t find it! It might have been a webcomic? I vaguely remember it was less page turning and more scrolling