Magic is a huge thing, and someone who can use magic is a huge thing.
The basics of healing magic, if they can be taught, can save hundreds of lives in first aid and change industries overnight.
Conversely, depending on what can be done with magic, spying, subterfuge, diplomacy, and warfare through unconventional means would have huge ramifications on the world.
The girl from another world would be a lynchpin that could potentially shift this world's culture and civilisation as a whole.
And of course, they're talking about the main character's dick instead of worrying about who they'd want to tell that magic's a real thing and there's someone here that can potentially explain the basics of it.