>>
Suggesting a plot for a story and searching stories with close enough plot.
Shota owns a teen slave.
As a present from a parent, boy gets to own his first slave. Its a meek girl couple years older.
At first he treats her as a playmate, but with time he starts to assert dominance, and not facing resistance do more and more cruel and humiliating things, eventually gaining interest is sex and indulging himself in it abundantly.