Derek snerked. Burn off some energy? Right. That was a euphemism if Derek ever heard one. "So you thought you'd go behind my back," he said, unpleasantly. "And 'burn off some energy' with one of my packmates?"
He leaned in close. "Why settle for one werewolf when you can have two? Or are you hedging your bets, in case things with me don't work out?"