"Ah," Ianto gasped, his fingers tightening in Sulu's hair to keep himself from pressing his head further towards him, flinging his other hand sideways to grip the edge of the sofa cushion next to him, pressing his back into the back of the sofa as well to keep from thrusting up into Sulu's mouth. The other man's nails, scraping him through the fabric of his dress pants, were a delicious feeling. A feeling that was driving him up the wall. And the humming...

Ianto moaned, low and long, tipping his head back slightly as he forced himself to loosen his grip on Sulu's hair, moving to thread his fingers through it instead, stroking slightly, scraping his nails gently over the other man's scalp. It took a lot of concentration on Ianto's part, but he was sure that it'd be worth it.