The cock torture! How long can you last?

I gently lick your swollen glans. My thick lips enclose your hard fuck glans and move carefully and gently on your cock in slow motion. I won’t jerk your cock or give you a really hard blow job, because I want you to suffer. You want to cum and you’re about to. Your whole body vibrates and you scream as if you’re coming. But you can’t do it. How long can a cock hold out like that? I’ll do it really hard and I’m merciless. Will the cock manage to cum like that?