So, I played again through it and just put the answers for every interacrion I had with Aaron to get his path here:
I continue my conversation with Aaron Salt.
“You aren’t quite the shark I’d expected, Aaron.”
I’d like to see Aaron. Despite his dirty trick, he seems like an interesting guy to know.
“Fine? That’s all? I was hoping we might get to know each other even better than that.”
“Yes, I love a good pretext. Why not?”
Take the oppertunity to call Aaron (x2)
When he tells you about the other person he is meeting be cool with it (Either: “Sure, let’s meet up. Where and when?” Or “Yeah, let’s meet up. Are you sure you can’t convince Candy to join us?”)
It may be an advantage to develop the Earrh Unearthing to get this option:
“Set up a meeting with Aaron Salt. Maybe we can combine our efforts with Psion in some sort of joint venture.”
Then you should get the option to invite him to the vacation.
May try it out, it would be interesting to see if it really depends on stats too or if it’s a path avaliable with every stat.