You're comment is a little vague so I'll just lay out the whole process:

1.  Don't have Adrian leave. Obviously.
2. Get Anna to 1,000 subscribers to get the email from Ken asking if he can take a photo with Anna.
3. Once you've taken the photo on Thursday, initiate the Ken sharing route.
4. Visit Samantha 3 times (this will happen naturally if you're learning Hacking from her) and accept to go with her to the Beach on Mondays.
5. Take photos of her at the Beach and at Ken's home on Tuesday and Friday when she's there alone. Eventually she'll ask if you wanna bang.
6. After you bang Samantha for the first time, Ken will ask if you can help him ditch his virginity. Choose the Samantha route instead of the Anna route.
7. Show him one of the pictures you took of Samantha and he will be unconvinced. Meet Samantha to bang again on Tuesday or Friday and take a picture of her when she's sucking on your balls.
8. After showing Ken that picture he'll ask you to talk to Samantha for him. Do so and return to Ken and tell him to join in the next time you bang Samantha on Tuesday or Friday.
9. After this, you can find Samantha and Ken fucking in various scenes in Ken's house when you visit. Ask why he doesn't go the Beach and he'll tell you he can't swim. Volunteer to teach him at the Public Pool.
10. Go to the Public Pool and rent it out for 3,000 dollars on three different days to get all the scenes.
11. Visit the Beach with Adrian and Anna on Tuesday where you'll run into Samantha. She and Adrian will realize they play games together online. (You can trigger this earlier but it's only relevant now)
12. Visit the Mall afterward and Samantha will flirt with Adrian. Immediately afterward, go to Ken's house and Samantha will suggest inviting Adrian to come to the pool with you three. Invite Adrian in his room and then head back to the Public Pool to rent it out again. You can repeat this but have to invite Adrian every time.
13. After you've seen the scene at the Public Pool you can find Adrian and Samantha fucking in her bedroom in Ken's house.