Tao knew to hold back, he always held back, even when told not to, just because he was never sure anyone could really handle it if he didn't. He wasn't sure he could. If he let go would he be able to pull himself back when he needed to or would he just be lost? His thighs shook and he felt his balls draw up wanting to hit that release. His right hand whipped around to the back of Riley's head as his thrusts got more insistent, needy. He hit the back of his throat and groaned. "Now, fuck, now." He gasped out as he came, holding his head and bucking into his mouth.