One of many hot suffocation by cock scenarios.
You are bound expertly to each other in a 69 position, laying side by side, with your arms and hands tied tightly at each of your sides. Both of you have mouth spreaders, with each other's cocks barely touching the back of each other's throats. This is an execution/death challenge. The one who chokes the other one out and cums down the other's throat goes free. You both have been given just enough slack for both to pull your head back to avoid gagging and choking. Both fight fiercely to get to the top position. Your opponent, after what seems to be an eternity, uses his long legs to roll you over onto your back. You fight desperately to not roll to your back, but it's hopeless. On your back you try to pull your head away from his cock, and at the same time try to thrust yours into him deeper, but he has too much slack and easily pulls up as you thrust. After a few moments of rest to catch his breath, he pulls out slightly, and thrusts back down violently. Now that you can't pull away, he easily reaches past the back of your throat and down, where his fat mushroom head gets lodged. With his body weight bearing down on your face, he easily holds his cockhead in it's fatal position. Gagging and bucking wildly, you fight for your life to breathe. He is easily able to withstand your jerking. You are now weakening from lack of air, and he senses extreme weakening of your body. He begins to thrust again, but at a much faster pace, and is careful to maintain the seal of his cockhead deep in your throat. He feels your body finally relax, as you fall unconscious. With your body limp, he goes all out. Deep violent thrusts bring him over the edge, as he pumps a massive load of ropes into your lungs. After he stops shooting, he quietly lays on you and stays down your throat for additional 10 minutes to make sure there is no life left in your body.