Seeing Shadows in a Cup and Mistaking Them for Snakes

To stay alive, Young Master Yuan had no choice but to give himself to a snake. After escaping danger, he fell ill. That snake became his nightmare. Snake demon x a scholar who fears both homosexuality and snakes A strange style, a little like an outline. There's a short story in the same series in my collection: Lonely White Rabbit. Theme: A young master and a snake demon.