Well, at least it's comforting to know that he doesn't get any less desirable as he gets older. He grins a little as Ianto leans in, well aware of how he's feeling. He's very familiar with that little thrill of being with someone you don't quite know as well as you ought to due to screwed up timelines.
To be honest, he's more than a little excited himself. Several years stuck with John and only a handful of other viable options (none of whom can remember him for more than two weeks) has left him very, very eager for new experiences in the love-making department.
He meets Ianto's kiss with confidence and practised skill, very different from the warm, open, loving kisses Ianto's been used to sharing with his older counterpart.