I started a new game for an evil character who was near that part, so I just fast forwarded to it and made separate saves to get there and play through it. I didn't want them to be permanent lol. Basically the dude all try to mind break L with drugs, and send you her "boyfriend" videos of it, depending on your choices on how to react to it, either she will be on her own in the final encounter and kills them all after a whole "there's a killer in the house" kinda scene where she hides in the house and ambushes them, when she finds out they're going to kidnap her sister to do the same to her, or you show up just after she finds out about that and stabs one, and absolutely slaughter them all like in the non NTR route. That's a 1st grade book report version of it.