https://comics.inkr.com/title/2899-forgive-me-for-sleeping-with-another-man-darling-a-widow-in-ecstasy-for-the-first-time-in-two-years (English)
https://mangadex.org/title/7e661681-9391-4247-ae98-e3e4c7af1ae3/forgive-me-for-sleeping-with-another-man-darling-a-widow-in-ecstasy-for-the-first-time-in-two-years
https://www.mangaupdates.com/series/njtgxc0/anata-hoka-no-otoko-ni-dakareru-watashi-wo-yurushite-ninenburi-no-modaeru-miboujin
https://www.dlsite.com/books/work/=/product_id/BJ081598.html
https://coolmic.me/titles/2868 (English)
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Forgive Me For Sleeping With Another Man, Darling— A Widow in Ecstasy for the First Time in Two Years

"Are you sure you're okay... with a middle-aged lady like me?"
Saya lost her husband two years ago. When a pure-hearted young man, Hayato, entered her workplace, her modest life working at a supermarket began to change. Through their casual flirtations... Saya began to reawaken as a woman.
"I know... we shouldn't do this sort of thing in the workplace, but..."
Alone in a storeroom together, the two awkwardly brushed past each other and then started to intertwine. Then, she touched a man's rock-hard equipment for the first time in two years.
"Darling... I'm sorry..."