How James came to be Harry Potter's Dad

3.

When Lily saw Severus on Platform 9 & 3/4 the next term, the first thing she did was run up and give him a big hug. She could hear James & Sirius in the background but she ignored them. On the train later that day, while she was patrolling the Hogwarts Express, her red and gold Prefects Badge shining on her chest, she heard a voice "Want to go to Azkaban Evans". "What do you want James" she groaned. She already knew what he was going to say, but it made her stomach lurch all the same.
"Arrangement Agreement Evans. Break it and you could get sent to Azkaban. I'd forget old Snivellus and come see me instead". Lily checked her watch and sighed with relief, her shift was over. She could go see Severus. Although he had replied to her owl almost instantly, she needed to talk to him in person. She saw him sitting alone in a carriage and she slowly slid the door open and slipped into the seat next to him. "Lily?" Snape asked, "Are you OK". "No. He came and told me off for hugging you. Said something about an Arrangement Agreement". "It's OK" Snape comforted her.