He took a second triumphant look at the way he trussed up the poor prisoner, he used the capped tops of her tongue and clit to anchor her to the restraining chair, face down. The result was the mudblood’s tongue was mashed into the head rest, as he arranged the prisoner’s ass to be the highest point, her bound clit ensured she had no leeway to move without causing excruciating pain to herself. To heighten the discomfort of his charge, he had arranged the captive’s hand in a reverse prayer pose, this nicely increased the strain on the captive’s back, her heaving breasts were squashed into the chair by the prisoner’s body weight, as she was positioned upside down her pert arse the focal point of Snape’s attention.