How do you lure Erik into Alice's room to get the dirt on him?
Firstly you have to got the first photo and then...
1. Blackmail Alice (when smoking) to sleep without clothes
2. At 1:00 to 3:00 am and when Eric is home sneak to the room when she is sleeping. There are three possibilities:
A) Alice sleeps with her pantis and bra
B) Alice is naked but Eric doesn't come to her room
C) Alice is naked and Eric comes to the room
If A) is happening then you should put a spider in her room (at 12:00 am) and wait to waike you up for help. Then tell her that she didn't keep her promise.
To be sure make this on a day that Eric is not at home (better a day before Eric is at home).
If B) is happening save at 12:00 and reload until Eric comes (for me it was a day where I could meet Kyra at pool).
If C) is happening then save before going for the camera because there is 50% chance to manage it.
Good luck and tell me if you succeded it.