Severus writhed, pushing down into the maddening, wonderful pressure of fingers, nudging his perineum, sliding inside.
Wiry arms tightened around Al's shoulders: he felt as though if he didn't hold on, he'd drift away, floating on a humid haze of pleasure. The waves rose as his hips rocked with a life of their own, his arse pressing back onto Al's exploring hands, his erection thrusting forward, sliding against Al's.
"That," he gasped: at once an affirmative and quite unhelpful in any decision-making. His voice was a choked whisper against the splattering sound of water starting to slosh over the rim and onto the flagstones.