They did need to have a code word, the only worry was that if the clones were around again, they'd have that memory. There was, of course, always the kiss -- even if Jack had been loathe to kiss even a Ianto-shaped object. "So that makes two different safe words," Jack said, scratching his chin thoughtfully. Not that they usually got that rough in their bed play but it was always fun to tease.
If Jack were a man who easily showed his feelings and believed in typical 'couple' conventions, he would have readily admitted just how serious their relationship was. Usually there were rings by this point, but Jack never would have done such a thing. The appearance of that second coat, however, did the trick. Jack should have minded that they were branded as a couple, but he didn't. It simply... fit.
"Not a single Bond?" Jack tsked softly. "What an absolute travesty. I don't know how you managed to get on with your experiment day without it. Such horror, no Bond in the place." Really, Jack deserved to be kicked for that one. Instead, though, Jack wrapped his arms around Ianto's waist, holding him tight against his chest, telling Ianto through his actions just how much the thought of a dead Ianto had killed him.