The cries of pleasure made the male smile and kept up the tempo and roughness.  Her words about loving it and wanting more, as well as greater pressure made him smile. Eli was glad she liked it, with determination fueling him even more now he began to pound harder, demanding his body to do more, to give her what she desired of him. His determination to give her as much pleasing feelings was his motivation. He loved how she was crying out, asking for more. It pleased the Slayer greatly.