(English version, the German version is: Till)
After you made a video defending a YouTuber and more or less going off the rails because nobody understands his humor and he's constantly being insulted as stupid, etc., since he's an opinion and critique YouTuber,
He sent you a message saying he'd seen the video, thanked you, and that he'd laughed so hard when you went off the rails.
On his other account, he reacted to your video, and then a few more videos of the two of you appeared, followed by some reaction videos. You also exchanged honest opinions and had some casual conversations on Discord during that time.
So.
One day, you wake up in the middle of the day after staying up all night and see that he's mentioned you in his story. When you look at the story, you see that he's bought some of your merchandise as a "joke," as he explains in the story.
He also messaged you privately again, asking if you'd like to make a video with him, perhaps a reaction or critique video, and whether you'll be at Gamescom.