I can recommend "Uncle CEO's Bad Love" to you. The male protagonist of this modern romance novel is a domineering president, and the female protagonist is a high school student. The male protagonist is 29 years old, and the female protagonist is 18 years old. It fits the setting of an old cow eating young grass. In the plot, the male protagonist is strong enough to snatch away Suo Ai. Step by step, he and the female protagonist form a different kind of love, which is very suitable for the conditions you provided! I hope you like my recommendation. Muah ~