Did you not see the episode, or...?
Eddy's wallet fell out and Kevin picked it up and saw his somewhat embarrassing middle name.
Kevin starts blackmailing him and getting him to do stuff, such as that scene. IIRC Nazz did remark on them being cute or something.
At the end DD reveals his own mildly embarrassing middle name so Eddy could feel better, then Eddy makes fun of him for it.>>96631501
Kids have weird priorities. A kiss you could deny or claim to be a joke, your name isn't something you can really deny or sweep under the rug ((refer to Current Year Man and "drumpf"))