Kenny has a habit of calling Kyle adorable. By no means is it a lie, because (at least, around Kenny) Kyle is nothing except adorable. Even from the very beginning, when Kenny had been pestering Kyle to confess to his secret crush, Kyle had finally agreed to phone his secret crush and confess right then and there - and though Kenny had insisted such an act was better done in person, he quickly changed his mind when he found his own phone beginning to ring.
Kenny had picked up the call and listened, smiling at Kyle and watching him speak:
"Will you go out with me?" Kyle asked.
"You're adorable," he'd said then, and more or less tackled Kyle.
Five years later, he still says it, because nothing has changed since then. At least, not in Kenny's eyes. To him, Kyle is still the most adorable boy - now, man - he's ever dated... ignoring the fact Kyle is the only boy he's actually dated.
But Kyle thinks he's changed. In five years, he's grown tired of being adorable. Quite the perfectionist, he wants to be more than just adorable. He wants to be the perfect boyfriend, to Kenny. He wants to be known as the guy who always drops everything and makes time for Kenny, even when Kenny can't always do the same for Kyle. Kyle reasons, anyone can be adorable, but how many people can treat another man right?
Kyle wants to be one of those people.
And he confronts Kenny, on their seventh-year anniversary. That he doesn't mind if he still really is adorable. That he wants to be more than adorable. That he wants to be perfect. To Kenny.
And Kenny laughs, almost hysterically, and it confuses Kyle, almost to the point of anger. Here Kyle was, admitting something seriously, and all Kenny could do was laugh? - But after Kenny calms down, he explains:
"Kyle, you are perfect to me. You trying so hard is what makes you adorable."
Before Kyle can respond, Kenny insists he has to make a quick phone call. It irritates Kyle slightly - a phone call now, of all times, on a date celebrating their seven years together? - and he considers telling Kenny to at least leave the table to make the call, but before he can decide he finds his own phone beginning to ring.
Kyle picks up the call and listens:
"Will you marry me?" proposes Kenny, with the goofiest expression upon his face.
Kyle laughs. At Kenny, at the memories. At everything.
"You're adorable," Kyle mocks, and though he never directly answers the proposal, when Kyle tackles Kenny, the latter gets his response.