Ianto wasn't sure if it was the nails digging into his shoulders, Sulu's muscles tightening around him, or the sounds echoing from his ears straight down to his groin, but seconds after Sulu came, Ianto followed him as well, everything that was keeping him from letting go coming undone now that there wasn't a reason to hold back anymore. Ianto's hands tightened on Sulu's hips and he couldn't help himself from giving it a few quick thrusts, gasping at the sensation of it, his head falling forward to press against Sulu's neck, moaning long and loud as the sensation of it all crashed over him and left him seeing stars.