https://www.dlsite.com/comic/work/=/product_id/BJ01228452.html
As always, please support the artist and buy his works.

The Secret Seduction of a Uniformed Girl Who Really Want to Be Fucked.

"If it were me...I'd make you feel even better than my sister..."
Kaede, a blonde, tanned gal, and Milan, a dark-haired, serious girl, are twin sisters with completely different outward appearances.
One day, Iriwa, a male student in a relationship with Kaede, is invited by Milan to her house when Kaede is not there, saying, "I have something to discuss with you about my sister."
As Iriwa wonders what on earth she wants to talk to him about, Miai covers herself up, strokes his crotch, and seduces him...!?
There was no way he could withstand the temptation of the big-breasted uniformed girl with the big, firm breasts, even though she is his grirfriend's sister....