The first chunk of yaoi pictures you’ll come across will be easy enough to spot and grab, but most require you to either knock them down or find your way to them to add them to your stash. That said they’re easy enough to find, you just need all your powers at your disposal to get them all.
It will save you a lot of time to grab what pictures you can when you see them. If you see one you can’t get just yet, just come back later once you have the necessary ability to get to the picture.
The yaoi image titles here are in the order I found them, with a few exceptions. A good number of them require the use of snap n’ pops to knock them down, but this isn’t mentioned since you get the snap n’ pops so early.
Push Me Higher - Found in the second floor of the Main Street Offices
Gaze of Thunder - Found in Bebe’s room at Bebe’s house
Twilight Boizu - Found taped to a filing cabinet at the South Park Gazette
Schooldazed - Found at the top of the top of the bleachers at the school gym
Tweek and Craig: Sweet Creams - Found in the examination room at Tom’s Rhinoplasty
Tweek and Craig: Before the Storm - Found in Tweek Bros. Coffee
I Choose You - Found in the storage room at the church
Can You Read My Mind? - Found in the bathroom at Freeman’s Tacos
Stargaze - Found by the piano inside the senior center
Tweek and Craig: Reaching for Love - Found inside City Hall
Hanabi Waltz - Found on the post board outside City Hall
Who’s Your Seme? - Found inside the boy’s bathroom at the playground
Starlight Whispers - Found inside the girl’s bathroom at the playground
Tweek and Craig: White Nights - Found in the very last room upstairs in Token’s house
Tweek and Craig: Golden Sparkle Days - Found on the north side of Stark’s Pond, hidden under a heart on a tree
Brush Buddies - Found in the manager’s room at the back of the Peppermint Hippo (Need Professor Chaos’s minion skill to open)
Tongue in Tweek - Found on a tent in SoDaSoPa
Happy Return - Found in a bedroom in Kenny’s house
Easy Breezy Daisy Boizu - Found in Kenny’s garage (Need the key found in Kenny’s parents’ room)
Craig and Tweek: Fleeting Embrace - Found inside Butters’s garage hidden behind a calendar
Hard Candy - Found inside Sloppy 2nds
Bedside Manners - Found in the bank
Tweek and Craig: Reverse Lotus - Found in Cartman’s garage hidden behind an electrical box (Need Captain Diabetes’s rage skill)
Craig and Tweek: Crotch Rabu - Found in the Photo-Dojo
Kemonomimi Kiss - Found in Kevin Stoley’s living room (Need Professor Chaos’s minion skill to get inside)
Open Lotus - Found in Clyde’s garage (Need a key found in a backpack in Raisins)
Swept Away - Found in the break room at the police station
Spoonful of Tweek - Found inside City Wok
Touched by an Angel - Found in the attic in Kyle’s house (access using snap n’ pop)
After School Special - Found in Jimmy’s garage (Need Toolshed’s blasting skill)
Seme Surrender - Found in the parents’ bedroom at Henrietta’s house
Twin Stick Shooters - Found in the second floor of the Bijou Theater (Need Human Kite’s Fartkour)
Tweek and Craig: Super My Heart - Found inside Raisins behind the counter
Just One Kiss - Found on the second floor of the school (Need Human Kit’s Fartkour)
Extra-Curricular - Found in the hallway in Big Gay Al’s house
Velveteen Dreams - Found in Nichole’s garage (Need Professor Chaos’s minion skill to enter)
Tweek and Craig: Steaming Surprise - Found in Ike’s room in Kyle’s house
Tweek and Craig: Soul Cuddles - Found in the backroom of Tweek Bros. Coffee (Fartkour from the roof of Bijou Theater, which you access via Fartkour inside the theater, to get inside)
Room for One More - Found inside a stall in the boys’ bathroom at the community center (Need the time stop ability to get past the electrified water)
Craig and Tweek: Heart Peeps - Found in Shelly’s room at Stan’s house
And that’s it for all 40 of the semi-explicit yaoi pictures you’ll find around South Park in Fractured But Whole.