Lydia moaned around him when she felt him pulling her hair. It wasn't something she ever really came out and openly shared with her partners, especially the ones with supernatural strength, but Lydia particularly liked having her hair pulled.
Hearing Derek starting to come apart was a bigger turn on than she expected it to be and the warning he gave only managed to spur her on. The temperature and consistency of it tended to leave a lot to be desired, but there were worse things than being able to get a man off and contain the mess. Most of the time, they were impressed that she'd even let them, anyway, so Lydia soldiered on, faster, in the effort to drag him through his climax, her fingernails digging just a little deeper into his skin as she held his hip a little harder.