Invite Marina to facefuck you until she blows

You grip Marina's hips lightly and pull her back with you until you bump against the wall of the stall. You settle in with your back against the hard surface and put her cock back in your mouth. "Stuff my throat with your cock, baby," you say.

Marina thrusts her groin forward until the back of your head is also stopped by the wall. "Mmm, gag on it, bitch," she tells you. Looks like your practice with those dildos is about to pay off. As Marina pushes her cock into you, you relax your gag reflex and let the head slip into your throat. She pumps in and out, and you **** yourself on her a couple of times to increase the pressure. "Look at you take all that black dick in your throat," she mocks you. She humps you harder now that she sees you can take her, and you manage to swallow almost her whole shaft. Soon, Marina's thrust grow more erratic, and she moans with pleasure, her cock jumping in your mouth.

You suck hard on her, and she goes over the edge, thick seed blasting your tonsils and flowing into your abused throat. You swallow quickly and happily while she swears at you. "Oh, fuck, yes! All that cum in your mouth. Swallow that nut, bitch." You slurp the last bit out of her cockhead, and she removes it from your mouth. Well, you certainly gave her some good service. Still, you could probably go even farther...