Martin pushing my limit started with the tongue trapper gag.  It fills my mouth in ways that other gags can't touch and it frustrates me to a point where I start losing control.  Add to that, a couple of bungees to keep me kneeling in an upright position by my throat, my elbows crushed behind my back and some clovers biting away at my sensitive nipples.  At this point, every minute feels like an eternity and making it to the finish line almost seems unimaginable until Martin comes in and swaps the gag.