The next day at school, Peter and Lily were greeted with cheers and applause from their classmates. They had become the talk of the school after their heroic defeat of the villain the day before.

As they walked to their lockers, Peter couldn't help but feel a sense of pride and accomplishment. He had always dreamed of being a superhero, and now he was living that dream with his best friend by his side.

But as they opened their lockers, they were met with a surprise. A note had been slipped inside, with a message written in bold, red letters: "I know your secret."

Peter's heart raced as he read the note. Who could have found out about his secret identity? And what did they want?

Lily noticed the worry on Peter's face and asked, "What's wrong?"

Peter showed her the note and they both knew they had to find out who was behind it. They quickly made a plan to investigate and keep their identities safe.

As they walked through the school, they noticed strange looks from their classmates. It seemed like everyone knew their secret now. But who could have told them?

Their first suspect was the new villain they had defeated the day before. Maybe he had somehow found out their identities and was seeking revenge.

But as they approached the villain's hideout, they were met with another surprise. The villain was tied up and surrounded by police officers.

"It wasn't me," he shouted as they walked by. "I swear, I didn't tell anyone!"

Peter and Lily were confused. If it wasn't the villain, then who could it be?

They decided to go to the one person they could trust - Peter's parents. They explained the situation to them and asked for their help.

After some investigation, they discovered that it was actually one of Peter's classmates who had found out his secret. He had been jealous of Peter's newfound popularity and wanted to expose him.

But with the help of Peter's parents and the police, they were able to stop the classmate and keep their identities safe.

As they walked out of the police station, Peter and Lily couldn't help but feel relieved. They had faced another challenge and come out on top. And they knew that as long as they had each other's backs, they could handle anything that came their way.