As I pulled down my pants, my penis sprang up energetically.
"Wow... Shinta-kun's dick is already this hard..."
"It's because Shizuno-san is too sexy."
"No, it's your fault."
We gazed at each other and laughed.
"Can you squeeze it between those amazing breasts of yours?"
"Sure, okay."
Nodding, Shizuno-san let me slide my erect penis between her voluptuous breasts.
"Ahh... incredible... Shizuno-san's huge, grown-up tits are just too much. The softness and warmth are even better than before."
"Geez, saying things like that makes me blush..."
Even as she said that, Shizuno-san firmly pressed her breasts together, giving me a paizuri. Then, she took me into her mouth for fellatio.
"Aahh... I feel like I'm gonna cum from these titty pussy..."
"Ah, no."
With a pop, Shizuno-san pulled her mouth away from my penis.
"Shinta-kun. Take that wonderful hard cock of yours and...
Insert it into my pussy."
"Yes."
I pressed the glans against the entrance of Shizuno-san's vagina as she lay on the futon.
Then, I slowly pushed deeper inside.
"Nngh... It's here, my own big cock... This feels so good..."
Just a little insertion was enough to make Shizuno-san writhe.
"Take your time and savor it. But in return, these huge tits belong only to me."
I groped Shizuno-san's massive, almost-bursting breasts.
"Honestly, Shinta-kun, you're such a pervert now."
"So are you, Shizuno-san."
"Guess we're even, then."
Shizuno-san smiled.
"Alright, here I go."
I began thrusting.
With each movement, Shizuno-san's exquisite mature pussy clung to my cock, as if trying to milk every last drop of cum from me.
"Ah! Hah! So big! Shinta-kun's dick is amazing!"
"Shizuno-san's pussy is incredible too! And your tits bouncing like this is the best!"
"Ahh, don't stare like that!"
Even as she lost herself, Shizuno-san's bashfulness was adorable.
I pulled my cock out for a moment.
"Ah, don't pull out..."
"Don't worry. It'll feel even better this way."
I had Shizuno-san turn her back to me.
Standing up together, I plunged into her from behind in one swift motion.
"Nghhaaah! All at once... deep inside!"
"I'll go even faster now."
I sped up my thrusts, moving quicker than before.
My hips showed no signs of fatigue.
In proportion, Shizuno-san's massive breasts swayed even more wildly than before.
They moved like living creatures.
"Nhaaaaaaaaaaaaaaaah! If you thrust that hard, my tits are gonna tear offfffffffffffff!"
Shizuno-san let out a twisted scream, one she'd never normally make.
"That would be a problem! If Shizuno-san's amazing tits got torn off! But I still can't stop! It feels too good!"
"Aaaaaaaah! Me too! My tits hurt so much... but it feels so goooood!"
Shizuno-san writhed as her enormous breasts bounced wildly.
"Right, this should work."
While thrusting from behind, I grabbed Shizuno-san's breasts.
Now they wouldn't flail uncontrollably, and she wouldn't be in pain.
"Then, I won't hold back."
I pistoned at my absolute limit.
"Ah! Ah! Ah! Ah! Ah! Ah! Ah! Ah! Aaaah!"
"Shizuno-san, you're the best! I want you all to myself! So I want to fill you with my cum and get you pregnant!"
"I want to have Shinta-kun's baby too! But not yet! I want more time with just the two of us, and you need to graduate college first!"
"Understood... but can I cum inside you now?"
"Yes! I'm on the pill! But it's not 100%, so if by chance I do get pregnant..."
"Then I'll take responsibility and protect you and the baby... Though, coming from me right now, that probably doesn't sound convincing."
"No, I'm happy. That sentiment means more to me than anything..."
Even as I thrust into her from behind, Shizuno-san twisted her upper body to face me.
Our lips met in a deep, lingering kiss.
"Ugh... I can't hold back anymore... I'm gonna cum... I'm cumming, Shizuno!"
My body trembled as the overwhelming urge to ejaculate surged from deep within.
"Yes, give it to me... Shintaaaaaah!"
Throb!
Splurt! Splurrrrrrrrrrt!
Without restraint, my glans kissed Shizuno-san's uterus as I poured my cum inside.
At that moment, Shizuno-san arched her back violently toward the ceiling.
Her magnificent breasts bounced with a boing.
"Haah... haah... haah... haah..."
"Haah... haah... haah... haah..."
For a while, we stayed like that, basking in the afterglow.
Eventually, we collapsed onto the futon together.
"...Sorry. I called you 'Shizuno' without honorifics again."
"It's fine, don't apologize. I was really excited too. I also called you 'Shinta' without '-kun.'"
"It made me happy."
"If you want, you can drop the honorifics all the time?"
"Nah, let's keep it occasional..."
Now that the heat of the moment had passed, my embarrassment took over.
Seeing me flustered like that, Shizuno-san giggled.
She gently kissed my cheek.
"I love you, Shinta-kun."
"Me too, Shizuno-san."
Still entwined, we held hands for a long while.