https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_741923/

Story
The school's idol, Shiraishi Mai-chan, actually loves older guys (oji-sans).
She seduces a withered, middle-aged salaryman who's slacking off in the park with her big tits.
"Getting to suck on such a cute girl's boobs...!"
It escalates into a parade of raw creampies!
Mai-chan gradually gets bolder and starts spewing dirty talk nonstop:
"Fuck my lewd pussy hard with your rock-hard cock!"
Enjoy the sight of a quiet, beautiful girl writhing in overwhelming pleasure!

So the Oldman hit jackpot one day Mai decided to fuck the first oldman she fell for.

By the end he became obsessed with Mai, lost his family after divorce and left his job, however he married Mai, she loved him so much she wouldn't let him go and 3 years later the married each other.
Lucky Oldman.

Base +23, thusgrim +6, nuts987 +15

Please look up what paizuri means before tagging it as such...

Base +6