QR codes don't just lead to websites, QR code scanners also don't instantly open the scanned contents (if it was a link).I appreciate the thought, but I'm still not gonna do it. I really enjoy the concept and the unique direction you've taken with it, but you really should consider making the game self-contained. I'm sure as hell not opening up any kind of external connection, be it to scan a QR code or follow an external link, from a porn game, regardless of how safe anyone tells me it is. Most people are probably gonna nope out just from the URL editing, let alone being asked to go to an external website and scan the QR code.
TL;DR: Most people aren't gonna be comfortable scanning a QR code or following an external link from a porn game, so you're gonna lose a lot of players whenever they hit anything that requires any kind of external tool or link.
The QR code just contains text. I scanned it. It didn't open a webpage, didn't open a new browser tab, didn't interact with my internet connection at all.
I was fully comfortable scanning it, since I actually know what QR codes are and how they work. The only way scanning one would be a risk, is if the user is an absolute dumbass.