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To Remus, Sirius is the most beautiful boy in the entire universe. He likes to say that the black haired boy is an exploration, that he's made of outer space.
He likes watching him all the time, when he's playing chess with Pete. When he's doing stupid thing with James. When he and Marlene dance to Bowie and Queen. When he wraps his lips round the bottle of butterbeer, ah, makes you wish you were the bottle.
And when he needs to shelter from reality he takes a dip in the scarred boy' daydreams.
Remus likes to think that Sirius is the 8th wonder of the world. So aesthetically pleasing to watch.He is stunning. He is wonderful. He is beauty. So much beauty that it hurts.
It hurts to imagine a world without him, without listening to his beautiful laugh, without his soft but sharp body beneath him, without his lips that are like the galaxy's edge and his kiss that are the colour of a constellation falling into place. Remus just can't. For him a world without Sirius Black is a boring, useless, horrible world.
Well what's left to say, Remus Lupin loves his boyfriend/Best Friend Sirius Black.