Okay, so you probably didn't really mean to ask for Remus/Lupin angsty breakup but I couldn't resist writing it. Here you go. XDDDD Don't hate me for it. *will probably write your first request anyway as well*

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Ever since his first transformation, the wolf had prowled around the edges of Remus' mind hungrily. Feed, it growled when it saw meat. Mate, it snarled when girls wearing certain scents (musky, inviting, the wolf didn't see any attraction in flowery or delicate perfumes) walked past. And most disturbingly of all was what it snarled whenever it saw Sirius with one of his many girlfriends -- Kill.

Remus thought of the wolf-mind as an 'it' because to call it 'him' would be to humanize it too much. Better to keep it as a scab or perhaps more accurately, a rash. An ugly rash, hive-like, that his clothes could cover up but that itched him all the time.

When he was told that there was an experimental cure for lycanthropy, he offered to test it instantly. Anything to get rid of that alien presence in his mind that gnawed at the corners of his thoughts like a dog with a bone that just wouldn't let go.

He drunk down the liquid, spent a week buckled down to a bed as his human body convulsed mindlessly -- and then didn't change when the full moon rolled past.

Remus woke up clear-eyed the morning after the full moon, and smiled up at his anxiously waiting friends. There was a general sigh of relief, then cheering.

The return to his normal life was easy. The wolf was quiet when the meat was laid out on the table and Remus considered becoming a vegetarian. Bellatrix leaned in just a little too close during Potions and all Remus felt was annoyance as she argued with Sirius.

Then she touched his cousin's arm (bloodtraitor), and smiled that Black smile, magic as dark as diseased blood, born of generations of inbreeding, and Remus felt the wolf inside awaken with an angry howl that made his blood run hot and his heart break open.

He passed out in the middle of Potions class, and when he woke, the wolf was there again in his mind as if it had never left. It did not greet him, or welcome its return, but Remus felt it look up at Sirius through his eyes and make a satisfied sound.

Even after Sirius left through the Veil, the wolf remained with Remus. The wolf would always remain with Remus.