Did you read the text when you walked into the living room looking for her? If you've never played the game before or don't remember what happened in the previous time you played it - there are hints in the text.
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Where would you leave a note for someone to read in your house?
Also: Here's a video of the entire sequence of switches back and forth - (edited for youtube)
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You can probably find your issue by reviewing it. (goes over 2-3 videos, I believe - Parts 37-39?)
You have to go through all the quests as they come up. It isn't a full sandbox experience. Also, there are no sex scenes with any of those three. If you've already seen:
- Tiffany- in the bathroom showering and sitting on the commode as well as her bent over online in her panties and her panty shot on the track
- Chantelle- phat ass
- Stacy- the main character flash his cock to her
Then you've seen everything even remotely sexual for those three.