Jack lifted his hips obediently, leaning up to drag his tongue up The Doctor's neck. "Whatever it is, I'm liking it," he said and let his legs sprawl open. The artron was fizzing in his head and shooting through his veins and he couldn't quite put a feeling to what it was doing to his insides, but it was definitely good. Palming the back of the Doctor's neck with one large hand, he moaned as he opened his mouth against the Doctor's carotid pulse and sucked.