I am so sorry but Remus John Lupin was not a sex god. Bro had never even seen a dick until Sirius. He was genuinely a little bit afraid of it the first time (it’s okay, though, because Sirius was very sweet and patient, of course). He thought people kissing in books was wild and sexual. He turned into a tomato and hid his face whenever there was a kiss in movies. He took things so slowly with Sirius that Sirius had to ask if he ever wanted to have it or if he was asexual or something. Then, once he got a taste, he became the most insatiable thing ever, practically begging for it every night.
Sirius Orion Black being the tallest, strongest, smartest, most powerful, and most attractive Marauder. Everyone in the castle wants a piece of him. He’s slept with most of the people in their year, along with the ones above and below theirs. He is, quite literally, the Casanova of Gryffindor Tower. He doesn’t study, but he still gets straight Os in every single class. He takes every single course for his NEWTs and gets Os in all of them. He’s one of those people that’s good at everything he gets his hands on. He’s friends with most people in Hogwarts, and has all sorts of connections with all sorts of people in every single social circle.
Enter Remus John Lupin, his geeky, awkward, kind of ugly, virgin, dork, studious, average height boyfriend. His idea of a wild evening is sitting in a corner, reading a book with some mildly sexual content with a cup of tea and a bar of chocolate. He clings to Sirius’ arm in social circumstances, twiddling his thumbs and silently watching everyone.
No one understands how, exactly, they got together. Everyone just knows that they’re absolutely adorable and madly in love.