If this was canon, there would have been a reason behind the demand for a kiss, there would have been Yuuko at the end laughing because she knew where he was, and there would have been Watanuki asking why Doumeki was getting doughnuts and a "because I suddenly got a craving" response.
But, my dear, you are not CLAMP and therefore have no intention of making us doubt the validity and mlove that is douwata. You need no reason to make the shippers doubt, no desire to torture us with possible "it's not just because I want to" kisses.
In which sense, I say this was lovely and in character and made me feel WAFF-y.