[ It may not be deep, but it's enough to send of a few more sparks of arousal. His pain tolerance may be crazy high but that doesn't mean his sensitivity has gone down all that much and he can't keep himself from hissing in pleasure at her nails in his skin. It's all very encouraging and he soon shifts into the next gear, picking up pace and intensity until the movements feel like whipcracks more than anything.
Going for the homestretch, he bites into her skin with blunt teeth. You don't mix food and sex, but there's no rule against playing. ]