I want to find a yaoi manga

I read a yaoi manga a few weeks ago and I forgot it's name -_-
The manga is colored and has around 6 chapters.It's about a parent named Agatho(or close) who helps an orphan boy because he sees himself in that boy.But Agatho didn't know was that that boy loved him.One day,this boy kidnapps Agatho and takes him to a cult or something similar to make him a "vessel"(vessel meaning making him a sex toy or something similar).This boy wanted Agatho all to himself and when the boy takes Agatho out of that place(after Agatho begs him to and promises to stay with him)they stay together peacefully for a while...Until the boy drugs Agatho(he can't walk or speak anymore),thus Agatho becoming his and only his.That's then end.
I hope you can help me!Thank you in advance!