https://www.dlsite.com/books/work/=/product_id/BJ01285672.html
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This one is translated to english!

"Oh no! I'm being pleasured by a man who isn't my husband!" Touko, a housewife, makes a decision to divorce her husband, who's been cheating on her often... but then realizes that she has no money.
She starts working as a housekeeper to earn money for the divorce. However, she makes multiple mistakes at work, and is now in danger of getting fired.
That's when she accidentally sees the dweller of the house she works at, Itsuki, masturbating. Touko apologizes furiously out of fear of getting fired... Then Itsuki asks her to help him masturbate in exchange.
Per his request, Touko shows him her underwear, causing his dick to bulge.
Unable to take her eyes off of the dick that's bigger than her husband's, she also starts getting wet...
The degree of Itsuki's requests slowly escalates...
And before she knew it, his hard cock was touching her drenched pussy...
With her excitement exposed, Touko shouts, "No! It's gonna go in!"

Webtoon version: https://webtoonscan.com/manhwa/during-work-of-a-married-woman-who-is-weak-to-insertion-raw/

I had to switch several times between the first few pages to make sure it wasn't the old love interest combing his hair differently, I'm still not sure honestly.

Base +9, Grimmy32 +11