Great news for all My Best Friend's Sister fans! We've just launched an exciting update that introduces collectible trading cards, shiny new badges, and exclusive profile backgrounds. Dive deeper into your sex journey by unlocking these unique rewards and showcasing them on your Steam profile. Complete your set to unlock special avatars and display your passion for My Best Friend's Sister in style. Ready to start collecting and show off your achievements? The adventure awaits—get started today! 
Collectible Card Update: New Badges and Profile Backgrounds!
Source: Steam Community (opens in a new tab)