I dont think he had a spider butt ahahaha
I had search the origin of the monster.I don't remember the name that is mentioned in the manga,but it is supposed to be some sort of hybrid of a bull and a spider.Since this is a yaoi mamga,you wouldn't want the seme to be a giant bull-spider ,right? ╮(￣▽￣)╭(づ￣ ³￣)づ
The monster name is gyuki.
I kept thinking of a wolf spider, myself. Although I know that's not what the author had in mind. Definitely one scary beast!
I'm glad for the ambiguity because I love wolves but hate spiders. I mean I don't mind the extra arms but... Did he have fuzzy bipedal legs+wolf tail? Or did he *shudders* have a plain old spider butt with a di- *chokes* No nevermind, I'm just going to keep pretending its the first.