Of course Ciel wouldn't do anything like that, because he was in league with the devil himself, and all he had in mind was revenge... Ciel himself wasn't reincarnated, after all.He remains in his small body, and in this story MC is an adult with a child's body.
And everything Ciel did was done by Sebastian, from teasing, killing, cheating, even becoming a corpse.
Ciel's job is only to order Sebastian, not to move on his own... And in this story, the MCs all do things on their own. That's the difference between the two stories. Maybe if there is something else you can add (￣∇￣")
I don't know... but... for me, the characters lack depth. I'm not a fan of his gang, the bulky guy, the vampire, or the dragon loli. They're deadweights. Only Ron is likeable here. Also, is this author, a bl-author as well? The mc is still a minor yet, he straddles adult men?! That's putting me off. Eew. That's like, pdf file bait or something. Even CIel Phantomhive don't seduce grown men like that. That's totally uncharacter of him, given that his future self is supposed to be wild like a barbarian.