Help finding this BL

I need help finding this one BL where this uke is sent to prison and falsely accused of a crime. The seme is like this big black blob monster with horns I think? And supper sweet! It’s super fluffy and helps the uke with prison chores. I don’t remember the plot, but I do remember this one scene where the seme was on a bunk bed and the monster creeped up on him and gave him a flower I think? And it was fluffy, but pleaseeee it’s been on my mind for 4 years