Platonic Moonwater Headcannon
Remus was the first friend Regulus made when he joined Hogwarts. Remus knew Sirius and Regulus weren’t on speaking terms ever since Sirius got sorted into Gryffindor and about the abuse the both of them experience at home so he takes the first chance he can get to befriend Regulus. The both of them get along really easily cause they both have a lot of common interests, majorly in books but Regulus only knows wizarding books so Remus starts introducing him to muggle books - literature and poetry. Regulus absolutely falls in love with them and they spend hours talking about them. They’d share notes on them.By now Sirius knows that the reason why Remus spends so much time in the library is cause he’s hanging out with his brother and he loves it cause now he knows his brother is in safe hands. Plus this gives him the chance to keep tabs on his brother through Remus.
Remus and Regulus start confiding in each other. In fact Regulus was the first one to know about Remus’s crush on Sirius. Remus finds out that Regulus loves playing the piano even though it was something his parents forced him to learn and that they actually have a Grand Piano back at Grimmauld Place but Regulus only knows Wizarding Piano Compositions cause that’s what his tutors taught him and you know what his family thinks about muggles….. so Remus then starts researching everything he can about Muggle composers- Beethoven and Mozart, Tchaikovsky and Bach , and he tells Regulus all about them. Once during the holidays Remus found a book called “ The Greatest Pianists ” at a bookstore so he buys it and brings it back with him to Hogwarts and lends Regulus the book, promising him that next time he’d look for a book with piano pieces ( or music sheets ) in them so that Regulus could maybe learn Muggle compositions.
But Regulus never got to return The Greatest Pianists because that was the year Sirius ran away and after that Regulus closed up completely. He stopped hanging out with Remus because of his anger at Sirius, even though he really missed his time with Remus. Remus knew Regulus was avoiding him but he didn’t push it cause he knew the younger Black brother was in pain.
So whenever Regulus was back at Grimmauld Place , he’d lock his bedroom door, take the book out of the little secret compartment he had on the floor under his bed and read it and cry cause he missed Remus. He missed being able to talk to him and spend his time with him. So he’d cry over all the people he pushed outta his life.
But then the letters started coming.
Letters written in a familiar handwriting.
In the envelope were two pieces of paper.
One was a small piece of paper with the words “ I thought you’d find these interesting ” written in Remus’s handwriting.
And the other- A music sheet to Beethoven’s Moonlight Sonata
Regulus immediately runs to the Grand Piano , rests the music sheet on the piano rack and starts playing the piece. By the time he’s done with it he’s in tears.
The letters don’t stop. Everyday during the holidays he wakes up to an owl dropping a different music sheet on his table and he’s rush to his piano and start playing them. By the end of the day he’d have learnt the piece by heart and could play it without looking at the music sheet.
His parents never found out about the letters cause Remus never signed his name on any of them.
More importantly, the letters were hidden in that secret compartment under his bed, folded neatly in between the pages of The Greatest Pianists.
