Here is the step by step:
- Introduce yourself to Zuri and Joey when you're able to go to the Mall for the first time
- Progress with the Main Storyline and talk to Joey every now and then until he ask for your help with his prank
- Accept Joey's request and go talk to Zuri, tell her that there is somebody that needs help in the Bathroom.
- Go to the Bathroom and you'll get the threesome scene with Joey and Zuri ( Unrepeatable )