So, I don't know for sure when Remus joined the werewolves so I decided he would leave this chapter.
First part is not mine- it's an extract from the book itself.
"Well, well, well," sneered Snape, taking out his wand and tapping the padlock once, so that the chains snaked backward and the gates creaked open. "Nice of you to turn up, Potter, although you have evidently decided that the wearing of school robes would detract from your appearance."
"I couldn't change, I didn't have my —" Harry began, but Snape cut across him.
"There is no need to wait, Nymphadora, Potter is quite- ah- safe in my hands."
"I meant Hagrid to get the message," said Tonks, frowning.
"Hagrid was late for the start of term feast, just like Potter here, so I took it instead. And incidentally," said Snape, standing back to allow Harry to pass him, "I was interested to see your new Patronus."
He shut the gates in her face with a loud clang and tapped the chains with his wand again, so that they slithered, clinking, back into place.
"I think you were better off with the old one," said Snape, the malice in his voice unmistakable. "The new one looks weak."
Tonks watched in shock as they disappeared towards the castle. She sighed, heading back towards Hogsmeade. She passed by the Three Broomsticks when someone grabbed her arm.
Swinging around, she pulled her wand.
"It's me, I'm sorry!" Remus said, pulling his cloak hood down.
She stared at him. "Prove it."
"Uh-"
"What did we talk about the last time we spoke?"
"I told you I was too old, too poor and too dangerous for you."
She lowered her wand. "What are you doing here?"
"I leave in the morning, I wanted to see you."
"Why?" She asked, turning to walk away.
"I'm going to be gone a while and I wanted to see you first." Remus said, catching up with her. "Please talk to me."
"Why? So you can tell me how poor, how dangerous and how old you are?"
"Nymphadora, please. I'm going to be living with several very violent werewolves for the unforeseeable future, I don't want to leave you angry with me."
She turned to face him. "Be careful, Remus." She said quietly. "You're a good person, and no doubt Greyback will use that against you. No matter what they say or do, remember the witches and wizards who are waiting here for you."
"I'm going to try to get away in December, to spend Christmas with Sirius and perhaps Harry. Will you come home too?"
She shook her head. "They'll need me here."
He closed the distance between them. He cupped her face, placing a gentle kiss on her lips. "Then say I can come see you."
She pulled away. "Remus, I can't. Because I don't know if you'll turn around and decide we can't be together again. You say you love me, and then you say we can't be together. But now you've kissed me- and want to see me again, but how do I know you mean it?"
"We can't be together, and you know why. I want you to be with someone better."
"Tell me you don't love me."
Remus looked at her.
"Remus, tell me you don't love me and I'll go, I'll go find someone else."
"I can't lie to you, but you should go find someone else anyway."
She shook her head. "I'll only love you."
"You shouldn't."
"But I do." She said. "And I'll wait for you to realise that we can be together."
"Sirius, I plan to come back." Remus said.
"The werewolves aren't safe. Greyback's pack is killing so many children- how can you even think of joining them?" Sirius demanded.
"I need to keep an eye on them. The Order can protect children if we can see their movements."
"And what if we fail? Will you participate in killing a child? Or biting them?"
"No-"
"Mate, Greyback might not let you have a choice." Sirius said. "Why not just stay here? Or go and stay in Hosgmeade with Nymph? That'd be good for both of you."
"She's working there, I doubt she needs me around."
"We both know that's a lie." Sirius said. "She wants you, Remus, and you want her for yourself- but you're pushing her away. Why?"
Remus sighed. "Listen, I have to go. I'll see you in a few months."
Sirius hugged Remus. "Moony, be careful."
