You tell her to stop

You know this is bad. You are so horny, if you dont stop it now, there might be no going back. Also theres always the threat of your girlfriend waking up, or somebody else walking in on you. You somehow manage to utter the words „wait, we shouldnt“ before she could pull down your boxers. She looks at you in a cute but sincere way and says „We went this far, I will have to tell your Gf that we made out, and she might break up with you anyway. How much worse is a blowjob now?“ She continues to pull down your boxers cm by cm, extremely slowly, while looking into your eyes. You ask hesitantly: „What if I cum in your mouth?“ She pauses, smiles, then gives a single kiss on your now half exposed penis shaft. She looks back up while continuing to slide down your boxers and says: If you cum in my mouth I wont castrate you.“ She smiles deviously. „If you cum in my mouth I‘m going to bite off your dick.“ Before you can say anything, she does one big lick from the base up till the tip of your dick, then proceeding to take the whole thing in her mouth. Her wet mouth feels too good. One hand grabs tightly around the base, the other around your balls. You are afraid she would crush them now already. Why wouldnt she, its her fetish. But you also know that she seems dedicated to her sick games. As long as you resist she will play by her rules. But if you lose, she will go through with her reward and your punishment. You know that. Now you have to worry about your dick. Her lips around it feel like a soft embrace, her tongue dancing around it feel exhilarating. You feel that you are getting close, you know that you can not hold it much longer and she knows it too, getting visibly excited. You have to stop her now!