“I’m the only one who’s ever seen you like this. The only one who’s ever touched you like this. Made you feel like this,” reminds me a lot of canon's "I'm the only one who can satisfy Victor." Was that on purpose? And lol at Yuuri thinking Victor was embarassed sleeping with inexperienced "plain" him, I don't know why, somehow, I get the feeling Victor past the shock isn't that puset. Who knows? He might even be extremely pleased with what that means for him.
Yes, Viktor’s initial shock and panic and finding out he was Yuuri’s first and only was entirely to do with the fact that how it all went down was definitely not how he would have done it if he’d known it was Yuuri’s first time. After that though, the idea that he’s the only one who Yuuri has ever slept with? Yeah, he’s not at all displeased about that