The hand at her neck moved, brushing along her hair while the hand at her arse moved up and down her leg, gradually shifting the edge of her dress upwards until her lower half was completely exposed. He tucked it easily underneath itself to hold it in place and continued to rub his palm against her skin. The sensation was so relaxing, so reassuring, that she hummed in contentment, feeling herself relaxing, sinking against his legs. Snape squeezed her bum slightly and then warned quietly, "I’m going to start now. You need not count." Before she could think to nod, his hand came down hard on her left buttock, causing her to gasp. No sooner had she registered the pain then his palm was rubbing her skin, soothing and diffusing the sensation from sharp pain to warm heat. After a few moments, he repeated the action on the other side and her fingers twitched against his ankles. 