Kieren is clearly unbothered and Sirius can't help but wonder if maybe he'd only imagined it, if in his desire for Kieren to feel some small bit of this, his mind has just made it happen.

Letting out a breath, he shakes his head, lips quirking slightly. Keeping his gaze locked on Kieren's he licks at the tip again, one hand loosely curled around him to keep him upright. "Too bad there's not a way to make the brain orgasm," he remarks with a soft laugh.