Sirius didn't have a broomstick of his own on the station, but he'd been having lessons on what he called his uncle's old Celeritas, although Arcturus frowned when he heard that and insisted it was very new. It wasn't the right size for someone Sirius' age, but he was doing well all the same, and the idea of showing Philip how good he was at flying was just too good to resist.
'Wait here and I'll get it!' he told the other boy, and that's just what he did, hurrying over to the back door and retrieving the broom from its place in the hall. He carried it back out to where Philip stood, and held it out proudly for him to look at.
'This is the 1849 Celeritas,' he explained. 'I'll fly it but before you fly you always have to check for safety.' And with that, he started making a show of inspecting the bristles, and tapping on the wood, and then holding one hand out flat just above it, towards the back, until he could sense the magic and knew the braking charm was working. It was a very well cared for broom, differentiated from its muggle counterpart not only in its condition but in the fact that there appeared to be a small compass affixed near the front end. 'You're supposed to check the-' he frowned, trying to think of the word, '-I think the calibrations? Those too, but I don't know how to do that yet. Uncle Arcturus was on the house Quidditch team at school so he knows everything about it.'