Wrists bound to her thighs so she can't resist, tongue restrained so she can't cheat and block her throat from his dick, and suction cups on her nipples to motivate her (Marie McCray)
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