"I won't shame you," Duo said with intensity. "I won't make people laugh at us or give them fuel to ridicule you for your choice." When Milliardo still didn't move, Duo said flatly, beginning to lower his hand, "I won't play your game, because, if you can't do this, then that's all it ever was."
Milliardo was suddenly there and taking Duo's hand, lifting it to his lips and kissing the calloused palm hard. Duo's eyes had widened at the suddenness of it, but then he was smiling softly and his free hand was lifting to Milliardo's collar. Taking a tight hold, he pulled Milliardo down to his level and his amethyst eyes shone into Milliardo's eyes. He took his other hand back from Milliardo's kiss and gave Milliardo a quick, painless, slap on the cheek.
Milliardo grunted and straightened in surprise, touching his cheek in confusion. "That's for running me through the wringer again," Duo said. "You gotta stop that, Mil. Make up your mind and keep it made up, okay?"
Milliardo blinked and then laughed. "How do you do that?" he asked when he had quieted. "How do you make me feel..."
Duo looked serious and said, "I can't MAKE you, Mil, you either feel something or you don't."
Milliardo Peacecraft is forced to take Heero and Duo on a mission against his wishes, but he finds out that Duo isn't all fun and games and Milliardo begins to develope a strange fascination for the ex-pilot of Deathscythe.
My notes: Duo and Heero have a pretty rough past that has left them codependent - Heero blames himself for Duo being nearly killed while they were in jail - and the prince/street rat vibe is strong here. But Duo isn't afraid to stand up for himself and demand that people see him for who he is, not where he came from.