After Dressing up as a Vicious Female Supporting Character, I Had Sex with the Male Protagonist?

Lin Meng opened his eyes and found that he was asleep in a classroom. Was he traveling through time? "Ding dong! Hello host, you have entered the novel "A Peep into the Sky", please work hard to survive!" "For detailed information, you can open the system space for further review, dear" Concept: Female supporting role takes the lead