Sephiroth teasing him like that earns him a tight squeeze around his length. While still expecting obedience, of course. He sure thinks he's making some kind of point there.

"Really, I want whatever the hell you've had to drink tonight, because it certainly lit a fire in you," Genesis half-hisses, half whispers back to him. That tone, those looks, that demand to be in his lap? How could Genesis not be wet? "Couldn't be helped."