Juyeon offer jiwook a dog. Jiwook is frustrated sexually bc juyeon and him don't do it ofter since the dog is here, he get horny and masturbate but is still frustrated bc he want someone doing thing to him so he use the dog, juyeon caught him on camera and make the dog do jiwook and realizes that Jiwook will never be able to have 'normal' sex because he wants to be degraded, beaten and humiliated.
P.S: The revised the scene (which is this extra) is from the author where they eliminated the dog scene but replaced it with a new smutty one. Extra 2 (AKA DOG EXTRA) will contain the dog scene in full glory (raw and uncensored)
https://lilyonthevalley.com/chapter/emp-chapter-38-end/.
Sorry for putting the the chapter 38 i just didn't wanna loose my bookmark but you can go back

Guys I'm currently reading the novel. And you guys do NOT wanna hear about the dog draft scene