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Regulus finished his final year at Hogwarts and managed to keep a low profile the whole time.with in a couple months of school starting Barty and Evan both took the dark mark so that Regulus wouldn’t be alone and so that they could try to all keep eachother safe throughout the coming war. He went through his year as normal and tried to act exactly as his parents wanted in hopes that he would be able to escape without too much fuss once graduation came. James wrote Regulus weekly letters which Regulus appreciated, he would read them and wish that he could be there with them, he even sent a few pictures of baby Harry here and there along with updates on his growth.
When Christmas rolled around Regulus managed to get his parents to let him stay at Hogwarts for the break by telling them that he had to do some more revision (Which was partially true). Regulus wished that he could’ve gone to see James and Harry over the break but knew that his parents would never agree to it.
Now Regulus had finished his final year at Hogwarts and was riding the train away from the place he called home for the past seven years. He knew that Kreacher would be waiting for him at the station to take him back to grimmauld place but he had other plans. Now that he had finished his schooling his parents no longer had anything to hold over his head so instead of going back to grimmauld place he would meet James at the station and together they would go back to his new home and his new life.
Regulus sat impatiently on the train as it screeched into the station. Once the train stopped moving fully Regulus wasted no time at all and eagerly grabbed his luggage and ran off the train. His suitcase was fairly light, only containing the few things he’d brought with him to Hogwarts that year; a few books, some clothing, and his wand. Regulus searched the platform for the brown haired boy and finally spotted him. He was wearing an old quidditch sweater from his time at Hogwarts, a pair of frayed jeans and a pair of tennis shoes. In James’ arms sat baby Harry who was only about seven or eight months old. Regulus ran to James eagerly and through his arms around both him and Harry. James broke from Regulus’ embrace for a moment to place Harry on the ground. Harry grappled to James’ leg to hold his balance and James wrapped his arms around Regulus gently listing him off the ground.
The two finally broke apart and James picked Harry back up. “Hi Harry. Do you know who I am?” Regulus asked with tears of joy in his eyes. Harry shook his head no with a look of confusion on his face. “I’m your Papa, Harry.” Regulus said happily. Harry’s face lit up a little bit and a smile graced his small face.
Suddenly Regulus felt something pull at his pant leg and he turned around to see what it was. “Master Regulus, are you ready to return to Grimmauld place?” Regulus heard Kreacher say. “Kreacher, tell my mother and father that I will not be returning to Grimmauld place,” Regulus said firmly as he crouched down to look Kreacher in the eyes, “I’m gonna miss you Kreacher.” Regulus whispered and though Kreacher’s face stayed stoic Regulus felt like he would miss him too. “Farewell, master Regulus.” Kreacher said before disaperating. Regulus assumes that Kreacher would say that he hadn’t been able to find Regulus and that he had run off but that didn’t matter to Regulus. All that mattered in that moment was that he was finally with the people he loved.