[Castiel doesn't blame Dean for asking that. Castiel isn't one to express desire, to admit that he wants things. It's due to a number of reasons, the most prominent being that most of his existence he'd been told that it wasn't right for an angel to want anything.

It's not as if he'd actually put much thought into his friendship with Dean turning into something more, but when the kiss had actually happened, he felt no urge to push Dean away. The desperation in Dean's actions had been palpable, and Castiel had wanted to grant him something he'd lost.

It'd been surprisingly nice.

The second time even more so, given that it had been his Dean and therefore felt more genuine, but even that had been fleeting. It's why the event had left that effect on him -- neither one of those kisses had been definitive, had lasted. They felt like part of a dream, and he'd wanted something more real. The event had simply allowed him to want it.]

It's... it hadn't occurred to me in that way before. I hadn't ever known you held that kind of interest in me, but... it wasn't bad. [Castiel quirks a smile at Dean and shrugs.] You mean a great deal to me, Dean. So is it really so strange? [If kissing someone is a way to show that you care about them, then it makes sense to him that they would do so.]