A fun predicament: Simply keep your back arched and you'll be able to breathe, but as you tire and lose your arched back posture, you'll choke yourself more on your chained collar and have more of his cock down your throat
It's simple: the better I think you're doing, the more clothespins I take off. Hesitate, use your teeth, or try and get away from me deepthroating you at any point, and more pins go on
