https://www.dlsite.com/books/work/=/product_id/BJ589939.html
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The Case of My Mother's Best Friend Who Became My Mistress [18]

"Hey... Haruto-kun... would you like to have sex with me?"
The main character is Haruto Egata (Haruto Egata), a student who moves from the countryside to the city to enter university.
Haruto is excited about his first time living alone, but his mother is worried about her son's safety and lets him live in the same apartment as her friend Reika Koumatsu, who was a good friend of hers during her school days, to keep an eye on her son.

this is apparently the Whole Volume, inc unrelated chapters:

https://www.dlsite.com/books/work/=/product_id/BJ01266087.html

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