https://www.dlsite.com/books/work/=/product_id/BJ723389.html
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"The shape of my pussy... it's going to change." Cuckold SEX where she cums with a dick bigger than his

“…If it’s Akira-kun, you’ll give it to me over and over again, right?”
She has been married for three years and is a housewife. She was worried about her brother-in-law, a college student, Akira-kun, who was living with her, and so had noticeably less sex with her husband. One day when Akira-kun was on summer vacation, they were alone at their house. Akira-kun looked at her with the eyes of a man, and she couldn't refuse his frustration...
The smell of a male, a toned body different from her husband's, a young and strong penis... When he poked her in a sensitive spot deep inside, her sense of immorality was replaced by pleasure, and she fell...
The gorgeous authors of "Detention sex for boyfriends," "With married women who can't get off with their husbands," "Overtime sex with the manager at a cafe," "For husbands who are struggling to make ends meet..." and more present an anthology of humiliation and immorality of cuckoldry!

Thanks for the upload and synopsis :)

Only pity is the censoring.

Base +19, Fofotron +7, blaqkthespian +6, yupokamusi -8