It could've been Jamie, since he tells the MC later on that he has trouble sleeping, so he could've decided to go for a walk that night instead. It also could've been one of the DIKs going over to the tree for a piss, like we see Nick and Jacob do in the game. Those are probably the most popular theories regarding this.
It's interesting that in Episode 6 however, there's an animated render with Bella which has the camera frame out by the window which then moves as if it goes into hiding after peeking at them. This is what sparked up theories about someone spying on the MC as well as the ones that propose the idea of Bella eventually facing the same fate as Cathy with the cluck, as in somebody taking pictures of Bella during that scene and possibly leaking them later on. Regardless of whether or not it's just the way the camera is positioned, the person walking by the window could also be Vinny checking who got his room now that the DIKs have their new pledges (MC and Derek) and the library was obviously available due to Vinny's departure.
In that case, it's not much of an intrigue that there was a frat guy outside the window. The whole point of that scene is that we don't know who is there and how it will affect the game as a whole.
It's interesting that in Episode 6 however, there's an animated render with Bella which has the camera frame out by the window which then moves as if it goes into hiding after peeking at them.
When MC was with Josy in ep10, the camera did a weird angle from the side. If in the case of Bella it can be described as a directorial move, then the scene with Josy was done intentionally. Someone was watching them through the keyhole and could probably use it against him in the future. It could have been Maya, who happened to overhear the conversation. Or Sara, who would blackmail him for fun. Or maybe nothing will happen and it's just another stupid theory.
But either way I think there will be some new leak in the next episode, but it will be directly related to MC.
But the nuance is that there are very few lewd scenes related to MC regardless of his path. A player can go virgin through the game until ep 10. But I'm sure the Jade leak or the Sara leak will be published.
Apparently making a video with Jade is a bad idea in all paths. Leaking Jade's sex tape - shutting down apparently her path and a potential threesome with Jade and Cathy. In Sage's path it will probably lead to a breakup with Sage.
