https://www.dlsite.com/maniax/work/=/product_id/RJ01383859.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_577314/

This was great. I loved the depiction of slowly getting her used to larger sizes. Looking forward to the sequel.

Base +18, Nopex1234 +6, cn5987 +6, grrblob +6, Seaea. +6

[Synopsis]

"Hey Kana, is it okay?"
"Eh, but..."
"I found a place where no one can find me, it's over here."
That day, I couldn't refuse my boyfriend Shun's invitation and I ended up doing something naughty at school.
"This is troubling, I can't believe that a serious student like Honda would have an impure relationship with the opposite sex... especially on campus."
"Please... don't tell our parents..."
"I understand how you feel. I don't want to ruin your family with the foolishness of youth."
"But I need to give you some guidance."
And so began my secret training with my teacher.
In the morning, I would spend the afternoon after school with a dildo strapped to my vagina and I would have to suck on the teacher's huge penis.
I would have to endure the increasingly escalating training for a month.
One day, the teacher took Kanako to a love hotel... and Kanako's heart was broken by the sheer size of it.
"It can't go in, it can't go in. It won't go in any further!"
"It's okay, just remember what I taught you."
She pleads to stop but her pleas are ignored and Kanako is assaulted by his 19cm penis.
Before she knows it, the pain is overwhelming...

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