What I base this of is that
KillJoys mentioned that there will be a storyline or an event atleast which involves the three. Henceforth the assumption that the scene could be the wild event.
My alternative guess for the wild event is Sam, because Dylan is not there on this day, none of the other males are developed enough and with a stranger the event can't really be made very long ( as I feel the maximum she can go that day is a blowjob), unless there are multiple strangers in the scene or if Sophia gets roped into a misunderstanding of sorts which requires her to do a sexual act.
Aiden's task will be in school so I can't consider it a wild event, too much restraint is there. I find it extremely unlikely the 2nd side job will hold one of the highlights of the game.