Perry opened the door without knocking and trudged inside.

"Ah! Perry the platypus!" Doofenshmirtz declared, preparing to spring his trap. Perry shook his head and held out a typed note. Before Doofenshmirtz could read it, Perry placed his hat over his heart and hurried out of the room. "...Perry?"

Doofenshmirtz stared after his nemesis for a couple moments before remembering the note in his hand. He nervously unfolded it and read it out loud to his empty lair:

"Dr. Heinz Doofenshmirtz,

I've been reassigned again, for good this time. I'm moving away from the tri-state area, and I figured it was safe now to tell you how I really feel. You've been my nemesis since I was old enough to be a member of the agency, and I've become quite fond of your schemes and aloof ways. I'm not sure how I'll tget along withour you, as my life has been devoted to foiling your schemes for so many years. To put it more bluntly, I've fallen in love with you.
I hope your life goes well and you're happy with your new nemesis and that I get another chance to foil your plans later in life.

Sincerely, Agent P (Perry)"

Heinz stared at the note in his hands, which was now damp with his own tears. He knew he was going to miss his nemesis, and the sudden realization hit him so hard he had to sit down.

"I love you too, Perry the platypus," he whispered to no one in particular, burying his face in his hands.

Down on the street, Perry stole one last glance up at the building before removing his hat and walking away.

A/n: More PerryxDoof! That's all I really have written at the moment, but more should be coming soon. I love this pairing.