Only belong to me

Ciel Phantomhive feels dirty and disgusted with himself as his nightmares of a very terrible, horrific yet fateful night seems to capture him every night. Sebastian, his very loyal demon butler decides to take matter in his own hands. Of course he won't just rid his memories like a normal person would think he would, rather he would exploit his masters body and make it truly belong to him. Since Ciel Phantomhive has already given him his soul his body can also belong to the demon and maybe with just that, he can take everything from his master, maybe even his heart.
P.S. maybe I will continue this or not. Depends on the readers I guess.