Both girls nodded, as they had known Alex's body condition ever since Katherine was too lazy to shower them individually.
"So, since Alex has both genders, he has two sets of sexual organs... The one that we girls have is called a vagina."
The other two girls were intrigued by Katherine's explanation, but Alex's brain was in a completely different dimension.
It just felt extremely awkward for him to watch his sibling learn about his body right in front of his mom.
More importantly, he already knows about it and just felt embarrassed to hear himself being explained right in front of his sisters.
"And the other sexual organ he has is called a penis... It's the thing that usually only men would have."
As Katherine calmly explained it to the three of them, Sophia's face started to blush a little as if she knew about it as well.
"You two have probably seen it endless times already. Your brother's penis is the thing that's sticking out."
"Where's brother's vagina?" Mary curiously asked, realizing she really hadn't actually seen it fully with her eyes.
"It's just right below his testicles... If you guys really doubt his body, just remember he has a period just like Sophia."
Katherine took a little pause before looking back at the three kids, examining the emotion on their faces.
Alex was more embarrassed than ever, as she expected. Meanwhile, Sophia blushed a little but still listened to her explanation.
Mary was the only one who didn't seem affected at all. Instead, her face was full of curiosity, wanting to learn more.
"Now I'm going to explain first about how the penis works... You two had probably seen Alex's penis getting all pointy, right?"
Both girls nodded in agreement as they thought back to recent times they had taken a shower tower, and even just an hour ago.
"That's called getting hard. This happens when men see something that turns them on——"
"What's turning them on mean?" Sophia impatiently asked, interrupting Katherine from finishing her sentence.
"It can be anything. It can just be a simple touch or seeing a girl naked, or it can just be seeing something attractive to them."
"Did brother get hard because they saw our naked bodies then?" Mary curiously asked.
"No, I——"
"It's okay, Alex... We know you didn't get hard because of looking at your sister's naked bodies.
As I said, it can be anything. Especially when they are still young, sometimes their body just has their penis erect at random times.
It's out of their control and not because of anything weird. So don't shame him when that happens, okay?"
Seeing both girls nodding in agreement, Alex felt a little guilty. He knew what Katherine said was wrong.
But he did feel something inside his body when he saw Sophia's growing body. This was an outlier that didn't apply to this case at all.
"Now we finished talking about Alex's body——"
"Mom, you still haven't answered the thingy that came out of Alex's body." Sophia quietly pointed out.
"Fine. I'll talk about that... When someone rubs or presses onto an erect penis, it can cause it to...ejaculate that white stuff."
Katherine paused as she took a short little breath, trying to calm herself down as she kept a straight face in front of them.
"It's called cum, or specifically semen. The purpose of it is to make a baby when it mixes with a girl's ovum."
"Ovum?"
Both Sophia and Mary looked a little confused. Even Alex looked slightly confused, as he had never heard of that word before.
"It's the thing that girls produce after they go through periods. They experience an ovulation period... It's essential in making life."
Alex immediately realized Katherine was talking about the egg, and the other two girls slowly nodded in acknowledgment.
"Ahem, now we're done with the boy's body, I'm going to move on to the girl's body to teach you guys about——"
Just as Alex tried to stand up and leave, Katherine pushed him back down onto the sofa, forcing him to sit next to his sisters.
"Alex, I need you to listen to this as well. It is important for everyone, not just for those two."
"Fine..."
After seeing all three of them fully seated in silence, Katherine finally resumed her lecturing.
"So, as you three know, all four of us have a vagina. And all of us have gone through periods except Mary."
The three kids nodded, letting Katherine continue.
"I already explained the period to you two, but I'm going to explain it again for Mary, in case she has forgotten about it."
A short explanation later.
"So, Mary, when you have a period, you can use this, okay?"
Mary quickly nodded in agreement as she accepted the pad from Katherine's hand, putting it into her pocket as Katherine resumed her talk.
"So I was saying, a girl's body goes through periods and produces an ovum afterward, which can lead to pregnancy when it mixes with semen.
Now, for a man to impregnate a woman, they will have sex... This is when a man inserts their erect penis into a woman's vagina and ejaculates inside."
Both girls looked a little intrigued again, except Alex, who just wanted to leave. He was starting to feel second-hand embrassment hearing it out of his mom.
"Remember, do not let anyone put their penis inside your vagina until you're an adult. And more importantly, you have to love them, and they have to love you back."
Seeing both girls nodding in agreement, Katherine turned her head over to Alex, who looked over to the side, seemingly a little distracted.
"Alex, you listen?"
"Yeah, I'm listening... I'm never going to let a guy touch me. I-I like girls." Alex murmured with a hint of annoyance.
Katherine didn't say anything back as she turned her attention back to the three of them at once.
"Now, there's just one more thing that I need to talk to you guys about..."
Katherine hesitated for a second once again as she reconsidered what she was about to say in her head.
It was an awkward topic, but one that was necessary sooner or later, as no one else was going to explain it to them.
"Ahem, this is going to only apply to Sophia and Alex for now, since the two of you are currently going through puberty."
Before Katherine could finish talking, Alex immediately knew what Katherine was about to talk about. But he had no choice but to sit through it.
"Sometimes, your body might feel a little weird. It's not your period. But it's a thing called sexual desire."
Both girls looked back at her with curiosity, as neither of them could understand what that feeling even is like.
"As the name implies, it's your body reacting to someone you're attracted to. Or it can just be your body's sexual urge naturally building up.
But since you guys are not adults yet, you can't have sex... So what you can do to relieve that frustration is masturbate."
Sophia and Alex both blushed at the same time. The two of them knew exactly what she was talking about.
Meanwhile, Mary looked a little confused. She couldn't understand it a single bit as she had never even heard of that term.
"For girls, what they do is they put their finger on the clitoris, gently rubbing the tip and the area around it.
Everyone is different, but that's the general gist of it. You can also rub against your nipples and touch your own body.
It might make you feel even more pleasure... But just remember, don't masturbate too much or else you'll grow numb to it."
Both girls nodded in agreement as Katherine turned her attention over to Alex, who had been looking over to the side the whole time.
"Mom, I——"
"It's okay, Alex. Dad should be here talking to you about that stuff, but I can explain it to you as well."
Alex wanted to tell Katherine he already knew, but he just couldn't muster the courage to do so as she started talking again.
"So how a boy can masturbate is very similar, but rather than playing with the clitoris, they gently stroke their penis with their hands.
It's a simple up-and-down motion like this... But be careful. You don't want to pull your foreskin too hard back.
Your body might not be fully developed enough for it to peel all the way back, so just keep that in mind when you play with it."
Alex silently nodded his head, resisting the urge to look away as Katherine stroked her hand in the air as if she was trying to domesticate it to him.
"That's pretty much all I have to teach you guys... Oh, and one last thing. During puberty, your body starts developing hair all over the place.
But it's completely normal, so don't worry about it. You guys probably had seen the hair on my body, right?"
Both girls nodded in agreement, with Alex frozen in place as it triggered some sort of memory inside his head.
"I can't wait for puberty!" Mary excitedly declared.
"You won't say that when your period hits," Katherine replied as she gently patted her head.
"Mom, how come you don't seem to be affected by periods at all?"
Sophia's sudden question caught Katherine a little off guard, but she quickly replied with one that made sense to the three of them.
"It's magic... It will make you super short and ugly if you use it when your body isn't fully developed, though."
All three of them instantly fell into silence, not asking her any further about how to use that spell.
"Okay, now you guys go to bed——"
"Wait, wait. We still have homework for today," Mary quickly pointed out, with Sophia about to say the same thing.
"Oh, really? What homework is it?"
"We still have to meditate tonight. Miss Amelia just taught us how to do it today." Sophia replied.
"That's good... How long did you guys mediate for?" Katherine curiously asked.
"We both meditate for about an hour," Sophia replied, her face looking just as proud as Mary, whom she had pulled closer.
"That's amazing for the first time. Alex, how about you?" Katherine asked, noticing him to be silent the whole time.
"I... I did very badly. I'm sorry, Mom. I disappointed——"
Before Alex could finish talking, Katherine suddenly gave him a warm hug.
"There's no need to apologize, okay? You didn't disappoint me. I'm always going to be happy and proud of you, okay?"
Seeing the two hugging each other, Sophia and Mary quickly moved in, surrounding Alex in a group hug.
"You're always going to be our proud brother, too!" Mary said out loud.
"Yeah, and I'm sure you'll be a great mage in the future, too," Sophia added.
"Thank you..."
As the four hugged each other in silence, Alex held in his tears as a surge of gratefulness rushed into his mind.