
Spoiler! From the novel!
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The wet patch on Ji-gu's underwear had spread significantly. At that moment, even Yeo-woon thought, Oh no, but watching Ji-gu climax from being spanked felt surreal. Without thinking, Yeo-woon muttered,
"You're such a pervert..."
"Ha, ah, nngh..."
"Pervert..."
'...Why am I a pervert?!"
"You just cvm from being spanked."
"That's not what happened!"
This part is a little after that.
"I hate pain!"
"Okay, okay."
"I'm serious. I'd rather hit someone first than be hit. I only put up with it because it's you! Do you know how preciously I was raised...!"
'..."
"I thought you... had that kind of preference!"
Ji-gu grumbled as if he was really wronged. Yeo-woon was momentarily dumbfounded. It's not even your preference? Then what the hell have we been doing..? Suddenly, they both realized they'd engaged in something neither of them actually enjoyed.
(Okay I forgot I don’t think he specifically says mom but he mentions he was preciously raised implying that both his parents never hit him.)

Spoiler! From the novel!
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
The wet patch on Ji-gu's underwear had spread significantly. At that moment, even Yeo-woon thought, Oh no, but watching Ji-gu climax from being spanked felt surreal. Without thinking, Yeo-woon muttered,
"You're such a pervert..."
"Ha, ah, nngh..."
"Pervert..."
'...Why am I a pervert?!"
"You just cvm from being spanked."
"That's not what happened!"
This part is a little after that.
"I hate pain!"
"Okay, okay."
"I'm serious. I'd rather hit someone first than be hit. I only put up with it because it's you! Do you know how preciously I was raised...!"
'..."
"I thought you... had that kind of preference!"
Ji-gu grumbled as if he was really wronged. Yeo-woon was momentarily dumbfounded. It's not even your preference? Then what the hell have we been doing..? Suddenly, they both realized they'd engaged in something neither of them actually enjoyed.
(Okay I forgot I don’t think he specifically says mom but he mentions he was preciously raised implying that both his parents never hit him.)
He does actually end up spanking him lol. They don’t find out each others preferences till after that. Also if memory serves me right he does cum from it but then he cries about hating pain and how even his momma never spanked him.