https://www.dlsite.com/books/work/=/product_id/BJ268616.html
As always, please support the artist and buy his works.

The secret menu is sex!? ~The secret password to have sex with the cute cafe clerk you meet every morning

A backstage call for sex! Let your panting echo in the back of the store...
Hot body of a café waitress, I will taste it all...!
There is a rumor that there is a behind-the-scenes call that allows you to have sex with a female waitress at a café that is famous for its arranged orders. I went to the cafe to find out the truth. The waitress who came out was my classmate Ms. Kagetsu!
And when I ordered, she blushed and asked me to come in the back... The rumor was true! Unable to resist with his longed-for Ms. Kagetsu in front of him, he tortures her with kisses and caresses, and she wriggles sensitively, writhing in agony, too erotic...!
However, her shame makes it seem as if she doesn't know about the backdoor call...?