Ianto never though to use a condom with Jack. He didn't sleep with anyone else, the incident with Petra aside, and he trusted Jack entirely. Besides, he didn't have the self-control to worry about something like a condom anyway. Not after waiting so long for this.
"Oh god," Ianto groaned, fighting the urge to come right then. Jack was so hot and tight around him and it felt so good. At Jack's words, he began thrusting into his lover, one hand pinning Jack's to the door, keeping their fingers locked together. His free hand wrapped around Jack's cock, stroking him. He angled his thrusts so that he hit Jack's prostate on every pass "Rwy'n dy garu di," he gasped, kissing Jack's neck, then biting at the back of his neck, wanting to leave a mark.