For real though, the day that Magnus Bane realises he’s met *the* Merlin is the best and most embarrassing day of his entire life.
I can just imagine Magnus meeting this gangly British guy on the streets of New York. He seems a little lost and confused, and Magnus, feeling sorry for him, decides to buy him a coffee. He soon finds out that the guy is a warlock, that he goes by the name Merlin (it’s not all that uncommon for warlocks to adopt the name so he doesn’t think much of it) and that he has no idea why, but he feels like he needs to be in New York for some reason so he portalled there without thinking through the logistics. Magnus instinctively trusts him, offers him his spare room and they become fast friends.
It’s only a few weeks later at Pandemonium that the realisation dawns on him.
Magnus and Merlin, distracted from their drinks by a disturbance on the other side of the dancefloor, rush over to help a small group of Shadowhunters who are trying to take down a sizeable pack of demons. It takes a few moments and some really impressive magic from Merlin, but they eventually manage to get the situation under control.
Magnus is temporarily distracted by the tall dark-haired Shadowhunter hovering near the a back of the group, but turns around quickly when one of the Shadowhunters introduces himself as ‘Arthur Pendragon’. When Magnus sees the look of recognition dawn across his and Merlin’s faces, suddenly everything makes sense and he cringes as he realises that he’s spent the last week or so making the oldest and most powerful warlock who’s ever lived watch reruns of RuPaul’s Drag Race with him.