His spine jerks at the continued motion of teeth at his lip, and the tug at his hair sends a cry of arousal free into the air as Haruto moves to his neck. The mana transfer is as good as over, he moves his hand away from the driver and the feeling fades, but as his strength returns to him, he breathes in sharply and wraps his other arm around Haruto, fingers grabbing onto his shoulder blade. If he doesn't let go, Haruto can't get away.

He continues to run his fingers across Haruto's collarbone but the return of sensation to his body and the brush of Haruto's limbs against his makes him realize something. "Hahh... ah... sorry, I'm hard." he whispers, feeling Haruto's lips vibrate against his neck as he speaks. He's not sure of anything right now, except that it's better not to let surprises that might make Haruto realize that he's doing something like this with someone like him pass by. Better to warn up front, right? He worries his lip himself, over the marks Haruto left.