The pain was dizzying. It almost hurt to breathe, but he sucked in a hard breath and held it for a long moment, until he could feel the pressure in his lips from his heart pounding too hard and not enough oxygen getting where it was supposed to be. He gasped, only to suck in another hard breath and resume the process all over again. Precum leaked from the tip of his cock, spreading over the hot flesh and dripping onto his stomach.
It hurt to not come at this point, but it was a double-edge sword. He was so far gone at that point that he could barely pay attention to what his hand was doing, the movements still jerky and erratic as his mind flooded with various chemicals - adrenaline, dopamine, surges of endorphins - and it made him dizzy. He drank it all up - gasping and holding his breath for the head-rush of lack of oxygen. Somehow it helped him focus on where his hand was, what it was doing, what he was trying to attain...
But his hips bucked against Gluttony's body and he cried out, his swearing now falling into mumbled Russian words that all seemed to run together. And then finally his breath hitched hard and felt his body tense, coming hard against his stomach, the longest strands reaching halfway up his chest. His whole body seemed flushed - and now trembling harder as well, as though it was the roughest orgasm he'd ever had. And for good reason too - It was.