Flug never really had a romantic partner. Ever. He's had crushes, and one romantic relationship which ended really quickly, but other than that, he had no experience. When he first saw you, he immediately felt a hopeless flutter in his chest. Dr. Flug and you hit it off. With endless work from him, he tried his best to get you to love him. Flug thought about you all the time, kinda going on a high of emotions. Demencia even noticed him silently giggling to himself when he was alone.
One evening, you two were in his lab. He was happily infodumping about all of his inventions, ecstatic just to have someone listen.
Flug was smiling beneath his mask. "Did you know that the Wright brothers' first powered flight in 1903 lasted only 12 seconds, covering a mere 120 feet?" He bounced happily. "Can you imagine being them? Being able to see something that YOU made up in the air, all because of you." He took your hands and bounced. "Fascinating concept, no? I want to be the next Wright brothers."
You suddenly got a bold idea. You kissed him.
Flug hesitated for a moment, in sheer shock. Then melted into the floor (or at least felt like it.) He could barely stand, his knees were so weak. He smiled weakly. "Hahemn.. Kiss..kisses..." He was so overwhelmed with the emotion, he couldn't form coherent thoughts. He was basically love drunk.