Shen Jinheng met Duan Yu when he was twenty-four and took over his family's company.
As an outstanding alumnus giving a speech at his high school, he was surrounded by people as he left the campus. He turned his head and saw fourteen-year-old Duan Yu cornered by a few thugs in an alley.
Duan Yu was small and thin, but not frail. His clothes were filthy and torn, and his sharply defined face wore a fierce, vicious scowl. He looked like a stray dog.
Shen Jinheng's heart softened for a moment. He chased off the thugs beating Duan Yu, then looked into the boy's dark, empty eyes and took him to a nearby restaurant for a meal.
From the way Duan Yu wolfed down his food, Shen Jinheng pieced together his situation. An orphan since childhood, he'd left the orphanage and spent his life roaming the streets, getting into fights, and never going to school.
Shen Jinheng didn't consider himself a good person, and his sympathy ended there. He shoved a wad of cash into Duan Yu's hands and prepared to leave.
But when he opened the car door, Duan Yu grabbed the hem of his jacket. His gaze was direct, and though his voice still had a trace of childishness, his words were far too calm for someone his age.
"Can I go with you?"
Shen Jinheng couldn't find a trace of pleading or helplessness in Duan Yu's expression, and the boy's actions surprised him, too.
Still, he agreed. He figured a rich kid like himself could surely afford to raise one child. Worst case, he could treat him like a puppy.
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Shen Jinheng found Duan Yu the best middle school around. Worried he wouldn't pass the entrance exam for high school, he paid to get him in there, too.
They got along well, and Shen Jinheng found that having someone else at home made things livelier.
The only complication was that he was gay. As he'd said, he wasn't a good person, and sometimes he had to cover up traces of his wild nights out before coming home. He didn't want to lead Duan Yu astray.
But no matter how careful he was, he still couldn't prevent it.
One time, he was drinking at a gay bar, letting a gentle young bottom undo the buttons of his shirt, when a loud crash sounded beside him.
Shen Jinheng looked up and met Duan Yu's gloomy, icy, ink-black eyes across the crowd.
Duan Yu was seventeen that year.
Refined, noble bottom x biting puppy top
Ten-year age gap
Trigger warning: The bottom is not a virgin. He used to be a top and has had lovers.
Premise: I'll leave this here for now