From a tumblr prompt list.

#50: You're the only one.

"You're the only one."

Arnold whipped around to find Helga G Pataki standing in his living room. He hadn't even realized he'd dropped his keys, "Helga? W-what are you doing here, I...I thought your flight was an hour ago." 1 hour and 4 minutes and 37 seconds ago, to be exact. Not that he had been counting...or wandering aimlessly around town to try and distract himself.

"Yeah, well...I figured I at least owed you an answer." Helga replied, suddenly finding the arm of his sofa interesting.

"...I thought you already had," Arnold said slowly, trying to ignore the sharp twinge in his chest at the memory.

Arnold could only stare in disbelief, trying to comprehend what he'd just heard, "London? Wow, that's...that's amazing." No, it wasn't. It was awful. She was leaving, and he was stupid and had wasted all the time avoiding telling her how he felt and now she was leaving.

"Yeah, it's...it's an amazing opportunity for me."

Arnold wasn't sure if he heard uncertainty in her voice, or if it was just his own pathetic desperation projecting.

"You haven't accepted it yet?" Arnold wanted to cringe at how hopeful he sounded, and attempted to reign it in, "Um, I mean it sounds like your dream job. What...what would make you stay." Damn that pathetic hopeful tone in his voice. Her eyes met his finally, and he felt his breath catch. He'd seen her look at him like that so many times over the 20 years they've known each other. He knew that look. He's had that look. Maybe she...

"You know what? Can't think of a single reason," Helga said with stiff resolution, before seeing herself out.

If Arnold's heart hadn't been breaking, he may have have let himself believe that Helga hadn't meant it.

"Helga what...what are you saying?" He refused to hope, but she was here in his apartment instead of on a plane to London.

And then what she had first said dawned on him.

She must have noticed the look on his face, and she defensively crossed her arms, "What, you develop a hearing problem since the last time I talked to you?"

"Helga-"

"I'd stay for you, okay? You're the reason. You."

Her face was red with embarrassment, but she held eye contact out of sheer stubbornness. Arnold was still processing the information. It felt too good to be true. For once, instead of running away, Helga came back. For him.

"...Me?"

Helga let out a frustrated groan, "Oh my GOD, Arnold I just got off a freaking plane for you. Can you please form a complete sentence?"

Arnold laughed breathlessly, shaking his head as he smiled at her, "No."

And before Helga could respond, he had crossed over to her, cupped her face and brought his lips to hers.