How Do I Deal with My Nemesis Always Flirting with Me?

[Two male leads, enemies-to-lovers, popular campus heartthrob VS low-key top student, both pure] Han Jialang and Xiao Sichen are sworn enemies: their families have been feuding for generations, they compete in exams, and they bicker every day. They even feel cursed just breathing the same air. Then they're forced to become roommates… and everything changes. Late at night, Xiao Sichen climbs into his bed: “Don't move. Let me rub your stomach.” Han Jialang warns him with a cold expression: “Worry about yourself.” Onlookers are sick of seeing how sweet these two are every day: Are they acting out a “I hate you, so I'm going to flirt with you to death” romance? Meanwhile, the two still insist they feel nothing, Han Jialang: “Who would like a narcissist?” Xiao Sichen: “Good boy, your ears are red.”, Holy crap, are they for real?!