The three started moaning more and more as the pleasure was just too much for them to hold in.
"When it's lubricated enough, you could just keep going, or you could slowly insert a finger inside.
But be careful. Your hymen is located here... This is sometimes how people determine if you had sex before.
It should be fine to put your finger inside as long as you don't insert something too big.
Remember, it's not the end of the world if it breaks. It slowly tears itself as you grow older, so it's sometimes out of your control."
As Katherine slowly inserted her finger inside her vagina, she bent it a little before moaning out again.
"Everyone is different, but there's a sweet spot that you want to touch——Hm!"
Seeing how loud she moaned out this time, all three of them slowly moved their finger inside.
Within a second, all three of them find their sweet spot as they out a high-pitched moan at the same time.
"In the future, you can also play with your boobs and nipple, but just focus on your sweet spot and the clitoris——Hm!"
All four of them didn't say anything else besides their moaning noise echoed the room as they kept teasing their sweet spot.
Soon, Sophia and Mary could feel something coming out.
"Mom, w-why does it feel weird——Hm!" Sophia asked as she could barely think straight.
"It's called climax——Hm!——That's when you finally reach your body's limit to the pleasure——Hm!——Just let it all out."
"Hm!"
Mary was the first to climax as a clear liquid flew straight out of her vagina, with her legs shaking a little.
Next, Sophia climaxed right after, shooting out a clear liquid as well as she clenched her legs together.
As the two girls recovered, Alex was at the breaking point as he could feel his cock was starting to feel painfully erect.
Unable to stop, his other hand slowly reached towards his cock as he began stroking it up and down.
Seeing Alex stroking his cock right before them, both girls looked a little shocked as they had never seen a guy masturbating.
Meanwhile, Katherine was about to reach her limit as well. Her eyes completely closed as she started to move her finger even faster.
"Hm!——I'm cumming!"
As Alex climaxed for the first time with his vagina, a clear liquid was shot right out along his cum coming out of his cock.
Feeling something hot on her legs, Katherine opened her eyes and realized the white stain that landed on her thighs.
For some reason, it turned her on even more as she finally couldn't hold it in and began climaxing.
Like her kids, she squirted out a clear liquid before calming back down. Then, in anger, she looked over at Alex.
"Alex, who told you to cum on your mother?"
Katherine questioned as her attempt to wipe the semen off her thighs was now stuck onto her finger.
"Sorry... I didn't know it could do that."
Seeing Alex genuinely looking down in shame, Katherine's heart softened after realizing he was still just a kid.
"Sophia's sleep posture is so annoying..." Alex thought to himself as he turned to the side to push it away.
Once again, her arms wrapped around his chest, almost as if she was doing it on purpose.
But hearing her steady breathing pattern, Alex knew she was already in a deep sleep.
Trying to sleep, Alex tried his best to ignore it. Yet, he was hit with another challenge as Mary suddenly scooched back a little.
With Sophia's body pressing him from the back and Mary's body pressing him from the front, his mind was starting to go all over the place.
"Calm down. They are your sisters. Don't think of anything weird, and just go to sleep."
After hypnotizing himself for a bit, he eventually fell asleep on the bed.
---
The next day...
When Alex was awake, he could feel something warm in his hand and right in front of him.
As he opened his eyes, his hands were firmly holding onto Mary's chest, with her back against his chest.
Meanwhile, Sophia was hugging him from behind, wrapping her leg around his body like a body pillow.
After letting Mary go, he suddenly felt something wet above his pants, surrounded by warm flesh pressing against them.
For a second, he thought Mary had somehow peed the bed, but seeing the red mark on the blanket, he immediately realized what it was.
"Mary, wake up. I think you're having your first period."
"Hm? What did you say——Ouch! Why does it hurt so much?" Mary groaned in pain as if she had some sort of delayed response.
Alex immediately pushed Sophia's arms and legs aside to get up from the bed to the drawer.
After looking for a bit, he finally found the new pad and a pair of panties for Mary.
The noise made by the two of them also finally made Sophia wake up from her sleep as she slowly opened her eyes.
"Hm? Why are you two up so early——Oh my god, Mary!"
Sophia immediately got up from bed and ran out of the room to get Katherine while Alex carefully pushed the blanket aside.
"Mary, just relax. The pain will disappear on its own. Stop tensing up so much——"
"I can't! It just hurts so much——"
As Alex got ready to pull Mary's pants down, Sophia finally came back with Katherine.
"Mom, Mary's period came." Alex pointed out as he handed everything over to let her handle it.
Seeing the blood-red spot and Mary groaning in pain, Katherine quickly moved over to the bedside.
"Mary, don't worry. Mommy is here. Calm down a little, okay?"
Katherine's voice seemed to have some sort of magic as Mary finally stopped panicking.
Slowly, Katherine pulled Mary's pants and underwear all the way down, revealing the blood stain that had soaked the bed red below.
As a stream of water appeared in her hand, she slowly directed it to absorb all the blood on the outside before moving onto her thighs.
After all the stains were gone, Katherine attached the pad to the panties before helping Mary put it back on.