I thought the girl on the magazine looked like the girl being led by the hand at the end of 14.1
I wonder what happened to them. My guess is that Mai confessed, but Yamabe pushed back. Maybe she was worried Mai was going to be dependant on her, or maybe it was some internalized "girls can't love girls" thing, maybe a mix of both and/or something else.
An interesting thing I just thought of is how we keep having some sort of issue between our main two, and then they meet a previous pair that had a similar issue, but crashed on resolving it, but our pair resolves it by communicating. The first pain point in the relationship was Haruyo backing out of the initial meeting and the pain that caused Kasumi, mirrored by Asai trying to back out of going to the same college as Ono. But where they crashed and... seem to have repaired their relationship, Kasumi and Haruyo were open about why it happened, why it hurt, and came to an understanding together. Now, they're having issues regarding what this relationship is beyond the roleplay of it, and it seems like Mai and Yamabe are going to have similar issues in their story.