He chuckles lightly, admitting that yeah, that's a start. As is what he's doing. This certainly isn't a conversation he's had with many people. In fact, Ianto may well be the very first. Mostly, in the past, he kept his other liaisons secret from each other, or at the most his partners were aware but not really considered or informed, like when they were back at Torchwood.
This really is a massive step away from the way he's lived his life.
He wraps his arms loosely around Ianto's waist as he leans in, and gives a comical little shrug against him. "You're the first person who's made me really want to," he admits, with what might actually be the tiniest bit of shame. He's actually starting to realise he might not have been quite fair to some of his previous partners, the ones he thought he loved and wanted to be with but actually never quite let in on enough of himself, or respected enough to change for.