I'm not sure if it's marked as BL, but it was a romance between a depressed student who liked occult (I think) and spent his summer in school. He looks into a book and finds a summoning circle for a human(?) flower demon thing and uses a bunch of his blood to draw the circle along with a flower pot he had. He almost passes out and thinks that he failed, only to see that it did work and the flower had turned into a pretty guy. They become friends and the MC sort of raises him, and the story goes on from there. I remember I was obsessed with this comic because it was so pretty and entertaining, but I don't remember what it's called I think the title started with an L (maybe) and it actually sort of stopped updating last time I checked. I swear that I subscribed to it, but it's not in my library anymore. Also, the flower demon has sharp teeth and I think he might've eaten meat, and I'm not sure about this part but I also think he might've been attacking people? The MC had brown hair and the flower demon had blonde hair and red eyes I think.