Chapter 410 (Mom)
Translator: RaidenTL
Chapter 410 (Mom)

Even as Si-woo pulled out his cock and began stroking it right in front of her, deliberately lacing his words with obscenities, Mom didn't do a thing to stop him.
Her deceptive attitude and expression stood in stark contrast to the overbearing, nagging tone she used to scold him.
That very look on her face only served to further fuel Si-woo’s arousal and perverted desires.
"And didn't we agree that you, Se-hee, and I wouldn't have 'sex' during the day while Se-young is watching?"
Si-woo emphasized the word 'sex' again, as if ruminating on the promises he had made with his mother.
Slap, slap, slap, slap, slap!
The rhythm of his hand sped up.
Mom gulped, looking tense as she watched his cock sway back and forth.
"It’s not just about not doing that! I told you not to make it obvious at all! We promised that since the kids are around during the day, I’d give in to what you wanted as long as we acted normal!"
"But then this morning in the kitchen, you tried to do something weird to me right in front of Se-young! And you even made me do those extreme things in the changing room!"
Mom stared at Si-woo’s massive cock, her voice tinged with a hint of resentment.
The incident in the kitchen this morning referred to when Si-woo had tried to stealthily grope her while she was preparing breakfast, even though Se-young was right there.
As a result, Mom had whacked him on the head with the ladle she was holding. In retaliation, he had summoned her to the changing room and forced her to give him a deep throat.
"And Si-woo, didn't you say you'd treat me with proper respect in our 1:1 chat room?! Since I didn't say anything, you've started casually calling me by my name now, haven't you?!"
Mom was pouring out all the grievances she had been bottling up.
"Ah, that? Seon-mi seemed to like it, so I tried it a few times. Since you didn't say anything, I figured it wouldn't matter if I called you that once in a while~"
As he spoke, Si-woo nonchalantly slipped her name into the conversation.
"Wh-what do you mean it doesn't matter?!"
Mom stammered in response, looking slightly flustered by how casually he used her name.
"Mom, did you really hate it that much when I called you Seon-mi in our texts?"
Si-woo asked the question as if testing her, even though he already knew the answer.
"It’s not a matter of liking it or hating it! A promise is a promise! Do you think I’m doing this because I enjoy it?"
Mom grabbed the hem of the shirt she was wearing and pulled it forward slightly, speaking as if the situation were unfair and she was the victim.
Having come to know his mother’s tendencies better than anyone through their past experiences, Si-woo found her snapping "Do you think I enjoy this?" to be incredibly amusing.
The clothes Mom was wearing now were ones she had changed into under Se-hee Noona's orders.
Though Si-woo hadn't picked them out himself, Mom was acting as if she were strictly following the hierarchy he had established.
Per Si-woo’s long-standing command, Mom wasn't wearing anything under her clothes.
No matter how loose the fit was, going out with nothing but a single T-shirt over her bare body must have been incredibly embarrassing...
Yet, that embarrassing and shameful act of exposure was undoubtedly acting as a spice for her pleasure, given her masochistic nature.
"I only gave in because you begged so much, Si-woo! A person needs to have a sense of responsibility! How can you be so different from one moment to the next?"
Mom continued to lash out at him in a lecturing, rebuking tone.
A sense of responsibility. A promise is a promise.
Si-woo suddenly recalled Aunt Gyu-ri saying that Mom had broken a certain promise she was supposed to keep according to the contract or the rules of the play.
For some reason, a smirk played on Si-woo’s lips.
"But it would've been better if you'd just told me right away in the 1:1 chat room. You're so good at playing innocent, Seon-mi, that if you don't speak up, I can't tell how you're actually feeling!"
This time, Si-woo emphasized her name again, even adding "you" to the address.
"You sometimes mix in my name when we're on the phone or talking face-to-face, Si-woo. And in the other chat rooms, you just call me by my name openly! It’s all getting mixed up, so of course I’m getting confused!"
Mom was making excuses for why she hadn't responded immediately when Si-woo called her by name in their 1:1 chat room.
Interestingly, she didn't raise any objections to him calling her by name out loud this time either.
It seemed that as long as they were in a private space without the rest of the family—and not in the 1:1 chat room—she didn't particularly care what title Si-woo used for her.
Between a mother and son, while looking each other in the eye and talking, both masturbating and calling her by name were being permitted.
Si-woo felt a renewed sense of pride and satisfaction in the status and authority he had secured.
"Fine, then! From now on, I won't use informal speech with Seon-mi in the 1:1 chat room, and I'll always treat you like a mother. That's what you want, right?"
Si-woo spoke as if he finally understood what she was trying to say.
"Y-yes... since that's what we promised..."
Mom looked bothered by the way Si-woo continued to blatantly use her name, but she answered as if she had no choice because of the rules they had set.
* * *
"Among the things Seon-mi and I promised, there was the one about not having 'sex' during the day when Se-young is around, right? But thinking about it now, isn't that kind of meaningless?"
Si-woo spoke to his mother again, using the explicit title and lewd vocabulary.
"M-meaningless? How so..."
Mom answered in a small, fading voice, as if she knew exactly what Si-woo was getting at.
"I mean, Se-young already knows everything anyway... She's even in the family chat room! She even sent photos of her breasts and pussy~ Why can't the four of us—you, Se-hee, Se-young, and I—just be open and comfortable at home?"
At this point, every member of the family was having sexual relations with Si-woo, and their secrets had all but been exposed to one another.
Si-woo, finding it ridiculous that Mom was trying to maintain a deceptive front only before Se-young, asked the question to test her intentions.
"Sigh...!"
Mom let out a deep sigh at Si-woo’s question about Se-young.
"That’s the point! The problem is that you told Se-young, Si-woo! Even if she knew, if it had just stayed between you and her, it wouldn't have come to this!"
Mom spoke with a whimper, sounding truly troubled.
"But Mom, if you think about it, you were so worried about Se-hee finding out at first, acting like the world would end. But once she knew, it turned out to be nothing, right?"
Si-woo spoke in an attempt to soothe her mood.
"Nothing?! I’m in this mess right now because of Se-hee! It’s awkward enough doing it with you, but do you think I want to use formal speech and run errands for my own daughter all day long?"
Mom complained to Si-woo, once again emphasizing the clothes she was forced to wear.
"I thought it was just something for a little while while you were gone, but how long is this going to last?! I can't even scold Se-hee for smoking with her friends anymore!"
"And I think Se-hee really considers you her Master, Si-woo. It’s not just a game to her!"
"Now that you've invited Se-young and Su-a to the group chat, everyone in the family except me seems to be taking this seriously. I can't even say anything anymore!"
Mom explained the situation at home and her own predicament with an air of genuine desperation.
It seemed she was quite shaken by the collapse of her relationship with her daughters—especially Se-young—which had been her last stronghold and the sole reason for maintaining her identity as a mother within the household.
"What does that matter? Mom is Mom, Se-hee is Se-hee, and Se-young is Se-young..."
Si-woo repeated the same words to his mother that he had once said to Se-hee Noona.
"Then you should have done it secretly! Why did you drag Se-young into a group chat where Seon-ju and Se-hee are both present?! Sigh...!"
Mom was now speaking to Si-woo in a tone that felt almost like whining.
"If I’d done it secretly, I probably would've gone raw and given Se-young a creampie without a condom. Would that have been okay?"
Si-woo switched hands on his cock and spoke as if teasing her.
"Are you joking right now?"
Mom’s eyes narrowed into a sharp glare as she spoke with a dead-serious expression.
"Alright, alright! But both Se-hee and Se-young know now, so there's nothing we can do, is there?"
Si-woo spoke with an air of detachment, as if the shocking events unfolding within the family were someone else's business.
"Sigh..."
Mom let out another long, frustrated sigh at Si-woo’s words.
"Why don't you just take this opportunity to seriously consider becoming my slave like the rest of the family, Seon-mi? It feels like your heart is already halfway there anyway. It seems to suit your constitution too~ Hehe."
Si-woo spoke playfully, probing her true feelings.
"Are you making fun of your mother right now?! I’m worried to death here!!"
Mom snapped at Si-woo, her irritation finally boiling over.