I've allowed you to do many pleasurable things for me, but you know that's not enough. When is the last time you really pushed yourself for me physically? Seeing you suffer and sacrifice your comfort for me proves your dedication in a way nothing else can. I'll teach you a breathing technique that will allow you to breathe through the pain I inflict, so you can endure and take even more pain for me. You will still feel the pain of course, this will only decrease the sensation of it a bit and allow you to push yourself further for me.