Because of who Lust was (because of her entire role) she could orgasm with great ease and the lightest of prompting. But she could also establish great control over her body when it came to that, and she had made men wear themselves out in desperation to make her come, never stopping until their bodies literally gave out.
She wouldn't make that Much's fate tonight, but she did decide she wanted to make him work for it. And, besides, Lust enjoyed the journey and the holding back. On the bed she stretched herself out, breath catching and moaning, willing to see how hard he would work and for how long.