You do

You cant help it. The best you do isnt enough. You dont even know if Nyx is close to cumming as you feel your orgasm approach. You want to say something, but cant, for obvious reasons. But Nyx seems to know anyway. She gets faster, and faster. "Awww, you´re gonna cum already?"
Then she lets go. You can do nothing. Your arms fight against their restraints as your body tenses up. You moan, the sound muffled by her, it takes 15, maybe 20 agonizing seconds before you cum. You feel your cum dribble out of your cock, but you dont feel any relief, any satisfaction, she perfectly ruined your orgasm and she knows it. You hear Nyx laugh. "Oh my god, look at you-oh right, you cant, but you should see how pathetic your cock twitches. You feel your cum slowly running down your dick onto your stomach and legs.
Nyx seems to enjoy the sight for a couple of moments, then she gets up.
You look down yourself, and see your already only semi-errect cock twitch a bit, you see the small puddle of cum it left.
"You know what that means." Nyx goes over to a big wardrope and opens it. "But you know, now that I think of it...maybe you´re gonna like your punishment...I´ve seen that video of Marla and you in the sex shop after all." She returns, a silver chastity cage in her hand.

"Well...lets put this cute thing onto your cock real quick, and then you still have some work ahead of you. Dont worry...you´ll have a lot of time to learn...a lot of time."

-

-

Bathed in sweat, you wake up. You lay in your bed, your sheets are pushed aside, and some sun shines through from behind the certain.