"Come on, you have to be more mature. You can't make Mom worry about you again."
As Alex slowly calmed himself back down, his mind was starting to get a little sleepy, as neither of the girls had returned from their trip yet.
"What's taking them so long?"
Curious, he got out of the bed, walking all the way to the hallway before seeing the two of them standing right behind Katherine's bedroom door.
Their heads tilted slightly to peek inside, with their body around the corner in an attempt to hide themselves.
He sneakily walked over to the two of them before tapping them on the back.
"Hey——"
"Ah!"
Both Sophia and Mary yelled out loud at the same time, turning around with their face full of fear, they saw Alex standing there.
"Who's there?"
Katherine's voice immediately sent the two girls running, leaving Alex confused as he watched them slam their bedroom door shut.
"Alex, why are you standing here in the middle of the night instead of being in bed asleep?"
"Sophia and Mary went to get water, and I got a little worried since they were taking too long... I checked, and they were just standing here before running away."
Hearing his explanation, a frown appeared on her face before it vanished from view as she started rolling up her sleeve.
"Those two little brat... Alex, go inside my room for a second. I'm going to go teach those two a lesson."
Alex nodded in agreement as he headed inside Katherine's room, waiting patiently in the bed as he heard a loud laughing sound from the other room.
The more he heard his sister's scream, a chill suddenly traveled down his spine as he started having a bad feeling.
"Why is Mom so mad? Did she put them into some sort of tickle torture?" Alex wondered.
After a while, Katherine finally showed up with Sophia and Mary in her arms before dropping them onto the bed.
"How dare you two spy on your mom? If it wasn't for Alex, you two think you would have gotten away with it, didn't you?"
"I'm sorry, Mom. We just got a little curious. We didn't mean to spy on you."
"We will never do it again. I'm sorry, Mom."
Sophia and Mary both apologized, subduing Katherine's anger a little. But the anger re-emerged as she noticed their looks towards Alex.
"Don't you two dare look at your brother like that. If I catch you two hitting him, you two are going to get a spanking."
"Sorry."
Despite the two of them apologizing to him, Alex started to realize he might have accidentally snitched on them on something important.
"Mom, why are you punishing them? They were just looking at you in your room. It's not like you didn't check on us when we were asleep."
"Alex, it's a different situation. It's a girl's thing——"
"Mom, Alex is a girl too!" Mary interrupted, her face not looking remotely happy from having to apologize twice in a row.
"Doesn't matter. You two shouldn't be peaking at someone when they are having their alone time."
"Really? Alone time with the door open?" Sophia argued as she started to get a little annoyed by her mother's attitude.
"Come here, you little brats——"
As Katherine reached towards the two of them, getting ready to punish them, Alex's mind was more confused than ever.
"Sophia, Mary, what are you two talking about? What did you two see?" Alex curiously asked as they started running in a circle.
"Mom's hand was——"
"Alex, move out of the way. If I don't beat these two up tonight, they will never learn their lesson."
Katherine quickly prevented Mary from finishing, trying to catch the two of them as they ran circles around Alex to use him as a shield.
After running around for almost a whole minute, Katherine finally decided to pull the trigger as she cast a spell that caused both of them to freeze in place.
"Um, Mom... were you touching yourself earlier?"
Alex's question made Katherine freeze in place, but she quickly recovered from it as she tried to deny his question.
"What are you saying? Ahem, Sophia and Mary, you two are grounded for the weekend. Go back to your room."
As Katherine snapped her finger, the two girls were finally free from the spell. But their faces were not happy at all.
"Mom, you don't have to be embarrassed by it. It's not like we had seen each other's bodies before.
Besides, you already helped me masturbate for the first time. You don't need to be so mad over Sophia and Mary for being... Ahem, I-I'm going back to sleep——"
Alex immediately got off the bed and tried to leave, but it was far too late as he accidentally leaked his secret.
"Mom! That's not fair! When did you teach our brother how to masturbate? We didn't even get a clear view underneath the clothes!
Why don't you teach us how to do it hand by hand? I-I want to learn how to do it! It's not fair!"
Seeing Mary childishly hit the bed on repeat made Katherine blush more and more red as she glanced over to Alex in anger for a second.
In return, Alex could only awkwardly scratch his head. It was far too late to hide the fact now.
"Mom... We are just a little curious. That's all. We didn't mean to offend you. We'll go back to our room and go to sleep."
As Sophia forcefully dragged Mary out of the ebd and bowed down in apology again, Katherine's heart started to feel a little guilty.
"You three really are the bane of existence sometimes... Do you two really want me to teach you how to do it?"
With zero hesitation, both girls nodded in curiosity. But Alex quickly got out of bed, trying to leave the room.
"Come on, Alex, I know you have a vagina too. Don't you want to see how it is done? Mom only taught you how to do it with a... penis, right?"
Sophia's words broke Alex's last defense in his head as he couldn't resist his curiosity. It was too big an opportunity to pass by.
"Ahem, you three sit over here and take off your pants... This is the only time I'm ever teaching you guys on this kind of stuff."
Both girls nodded in agreement again as they straight-up took off all of their clothes before sitting down on the bed.
However, Alex stood still next to the bed with his pants on. He was hesitating as he didn't want to reveal what was underneath.
"Alex? You okay?" Sophia asked, noticing his hesitation.
After a short struggle, Alex's lower body took control over his mind as he slowly took off his pants and underwear.
All three of them could see his cock already fully erected. Still, Katherine chose to let him stay in the room as she started her sex-ed lesson.
"To masturbate as a girl, usually you need to get into the right mood first... Like thinking of someone you love."
"Mom, do you think of Dad when that happens?" Sophia curiously asked.
Seeing Katherine nodding in agreement, Alex's mind suddenly felt a little jealous. But he quickly shook his head a little to get that out of his mind.
"Let's get back to the lesson... So first, you want to spread your legs a little. Then, you move your finger to open the cover, called the labia.
Inside, you want to find a little bumpy thing on the tip called the clitoris... It's one of the ways that can make a woman reach their climax."
As Katherine took off her own panties, her face blushed a little as all three of them stared right at her crotch.
Slowly, she spread her legs apart, revealing a little bun underneath the trimmed bush as her finger gently pushed open her labia.
"Just gently touch it to feel it a little——Hm!"
Katherine whispered, holding in her moans as she moved her index fingers onto the protruding bump.
Meanwhile, Sophia and Mary started copying what she was doing as they reached their hands down, moving their fingers to spread their underdeveloped entrance.
"Ah!"
The two of them both moaned out at the same time, feeling a shockwave of pleasure hit their mind the moment they touched the tip inside.
"Alex, you don't want to try it?" Katherine curiously asked after noticing him staring at her crotch the whole time.
"I... I don't know."
Seeing him shyly looking away from her, Katherine suddenly got up from her chair and sat down on the bed next to him.
Before he could react, she gently guided his hand down toward his crotch, going all the way underneath his erect cock.
"Girl's genitalia feels a lot more intense. You sure you don't want to try it?"
The soft, warm whisper traveling to his ear on top of the moaning sound coming from his two sisters made him more curious than ever.
He could feel genuine enjoyment coming from the two of them, and the idea of just touching his own body part wasn't really going against his moral code.
Just as he fully pushed his testicle up to find his own protruding bump, both girls suddenly stopped to watch him reveal his lower body fully.
"Alex's vagina looks like this?"
Sophia's comment made Alex's face blush red, but he couldn't stop at this point as he gently spread the small, thin line with his finger.
His clitoris was in full view for all three of them to see. A protruding bump that looked almost the same size as his older sister's.
"Hm!"
The moan shocked Sophia and Mary a little, as they couldn't believe that their brother could make such cute sounds.
"You two, stop staring at your brother... Just keep exploring your own body. Try to touch around the clitoris to see if your body feels a little different."
As Sophia and Mary shifted their attention back to their bodies, they soon started to enjoy the sensation they were feeling more and more.
"Now, you might have noticed your finger is a little wet... That's the lubricant that your body naturally produces."
Katherine explained as she moved back to her chair, watching the three of them from the side to make sure they didn't accidentally hurt themselves.