Sirius wonders if Kieren's silence is meant to be his answer and can only hope it's a favourable one. Grinning a little, he takes Kieren once more between his lips, tongue dipping into the delicate fold of his foreskin when he feels an unmistakeable pulse. A throb.

Heart leaping, both in wonder and possibly slightly in fear, Sirius glances upward only to see Kieren staring down at him with wide, light eyes. "Did you feel that?" he asks, lips still brushing soft skin.