I doubt I'm the first to explain, but this is an intra-game joke between Drifty and Digi. In Leap of Faith, the group attends a Kink concert and during a break Kindra jumps onto the MC and kisses him, wrapping herself around his waist and exclaiming "You came!" ... then realizing he's not HER MC (no tats, different hair) and looks to Lexi (who's standing right next to him) and says "Oh, this is your guy, isn't it? So clearly the events where she's "revealing" the MC in Artemis happen after the events in Leap of Faith, and then at the party, Lexi's expressions when she sees the MC are basically her trying to remind herself that THIS GUY isn't HER GUY. Also, in a commentary, Drifty explained that one of the reasons his MC never got tattoos is because of their prominence in Artemis.