Up and down with the odd grind, holding David down and holding him in, riding him and owning him as much as he possibly could through every shudder, every twist, and every clench of his body. He wants to keep it slow. Needs to keep it slow but soon the heated need in the pit of his stomach starts to take over and he works harder, short, shallow little lifts and falls that have him rocking in place more than anything else, trying to get more, harder, deeper-