Basically Childermass getting reduced to trembling, too fucked to move blissed out state by the raven king fisting him. +1 if childermass sort of initiates it, like begging for more when he's got 2/3 fingers there. +1 if the raven king tells him its a gift to be so trusted to do what he's asking and childermass is like "your my king, i will always trust you" So yeah the Raven King doing it to him slow and careful, and maybe at the end telling.him how well he did, how proud if him he is.