26. Theatre (Twin Stick Shooters)
Head inside the cinema and look for the pinwheel in the left side of the theater. Destroy the objects blocking it then use the Fartkour buddy power to reach the ledge. The fanart should be immediately accessible. From here, you can get access to the adjacent building (Tweek Bros Coffee) where you can get two more fanarts.
27. Tweek Bros Coffee - Storage Room (Tweek and Craig: Soul Cuddles)
After reaching the upper ledge in the theater, use the ladder there to reach the rooftop. From there, use Fartkour to reach the roof of the coffee shop. There’s a roof access there that you can enter which leads to the part of the storage that will be inaccessible from the other side. The fanart is somewhat blocked by a poster so remove that first before you can collect the art.
28. Tweek Bros Coffee - Cafe area (Tweek and Craig: Before the Storm)
This art is found in plain view, pinned in the bulletin board to the left of the counter by the door. Very hard to miss.
29. Playground (Starlight Whispers)
Found inside the boys’ restroom in the Playground, attached to a cubicle.
30. Playground: Girls’ Restroom (Who’s Your Seme?)
Found inside the girls’ restroom in the Playground, attached to a wall in the middle.
31. Big Gay Al’s House (Extra-Curricular)
This fanart is found in the corridor connecting the living room and the bedroom. It’s in an open area so it’s hard to miss.
32. Nichole’s House (Velveteen Dreams)
This is found inside Nichole’s Garage. It has an electronic lock that can be shorted by your Haywire buddy ability.
33. Butters’ House (Tweek and Craig: Fleeting Embrace)
This is found in Butters’ garage which is initially locked. You’ll only get the key by completing the main quest The Hundred Hands of Chaos. After getting access to the garage, pop the calendar in the back to make the art fall down for you to pick up.
34. Cartman’s House (Tweek and Craig: Reverse Lotus)
This is also found in his garage. Flip over the heavy object with the buddy power Diabetic Rage to reveal the art behind it.
35. Stan’s House (Craig and Tweek: Heart Peeps)
Head to Stan’s sister’s room then pop the framed art on top of her closet to get this.
36. Kyle’s House (Tweek and Craig: Steaming Surprise)
You’ll find this in Ike’s room, beside the door to the right.
37: Kyle’s House - Attic (Touched by an Angel)
This is found in the attic of Kyle’s house, which you can access during The Bowels of the Beast main quest or after completing it.
38. Homeless Camp (Tongue in Tweek)
You can find this during and after The Hundred Hands of Chaos main quest. Before taking the cardboard tunnel shortcut, you’ll find this art in an orange tent beside the cardboard tunnel.
39. Kenny’s House (Happy Return)
Check the other room across Kenny’s to find this on the right-side wall.
40. Kenny’s Garage (Easy Breezy Daisy Boizu)
This is found inside Kenny’s messy garage. It’s locked so you have to get the garage key from his parent’s room first.
After collecting all 40 Yaoi fan arts, Craig's dad will ask you to report back to receive your final reward. Which is basically just this piece of fan art:
Congratulations!