A lot of people are saying it doesn't make sense, and I say read it carefully.
Zoe

James looked out of the compartment and saw Lily, Marlene, Dorcas, Mary, and Alice. Lily was as red as her hair when she saw James.

"Alice stop," Marlene argued.

While Alice and Marlene argued about Sirius hurting Marlene, Mary obsessing over Remus, Dorcas and Lily where the only ones not talking about the group.

"Lily, look," Mary said pointing.

"I see Mary," Lily responded.

"Alice, Marlene, stop! Look if you want to know what he'll do he's right there." Dorcas has had enough.

"Lily, you go in first," Dorcas said now a little more calm.

Dorcas had found out about James and Lily because she was there in the corridor.

Lily knew what Dorcas was doing, so Lily finally said.

"Alright let's go."

Lily opened the door, and saw James. He went redder than Lily hair and she did too.

"Um," Lily started. "Alice, Marlene, is there something you need to say?"

Alice was not talking as much as she was out there, but Sirius was just smiling.

"James, what's wrong with your face?" Sirius would ask since he was with James and also knew.

"Nothing Sirius," James managed to get out.

"By the way Alice we heard every word," Remus said not looking up from his book.

"Really?" Alice panicked.

"Yup," Sirius answered.

Alice ran out to her own corridor with Frank.

"Marlene," Dorcas started. "Tell him what you told us,"

Marlene's feelings just poured out of her. She confest about cheating on the O. W. L. 's, and most important her love for Sirius.

After she said that she ran to find Alice.

"What in Merlin's name was that?" Dorcas asked.

Dorcas left to try to find Alice and Marlene.

"Well I have to go see what Marlene was so crazy about," Sirius said standing up.

"Peter go chase down the trolley, Remus go make sure he doesn't get lost." Sirius continued.

Remus and Peter left leaving only James and Lily alone.

"Sirius knows," Lily guessed.

"Dorcas knows," James guessed.

Lily shoke her head.

"Yeah." She said.

"So how's Sirius reacting?" Lily asked.

"It's Sirius, there's no telling how he feels, but he does like Marlene." James answered her question.

James and Lily talked until they saw Hogwarts.

"Finally, Hogwarts." James sighed.

Lily laughed. James looked at her with a bad idea. (Not that you sick minded children.)

"Why are you laughing at me?" James asked.

"Because you looked like a little kid excited for school," Lily said in between laughs.

"Stop laughing at me," James whine like a little kid.

"Stop, Potter. Stop." Lily said in between laughs.

"Why Evans," James asked.

"Because," Lily said.

James looked around to make sure Remus, and Peter weren't near by, or worst Sirius.

When he made sure no one was there, he kissed Lily.