Which i remember =
1. must have had sex with each of them at least 3 times, LP>75 and GP "=" 50 (this information from wiki)
2. And i had trigger this event in pub (20.00-24.00, but i forgot which day) when anna and kleio are in there together, but sasha is not in there.
3. u need to finish threesome event to trigger foursome (include Sasha) later.