https://www.dlsite.com/books/work/=/product_id/BJ231529.html/?locale=en_US
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Netori Massage - Being relaxed next to my boyfriend...

He is gently and lasciviously teasing her tender pussy... She is just getting a massage... Why is she being made to cum next to her boyfriend...!
--Kyoka is on a hot spring trip with her boyfriend Kohei. After soaking in the hot springs, she returns to her room, eager to have her first experience tonight... only to find that Kohei has fallen asleep under the treatment of the masseur, Miura!
Miura offers the masseur's treatment to Kyoka, who is left behind. She is deceived and receives the treatment, but... it was all a trap...! She is played with in the most extreme places... exposed in her underwear... her pussy gets wetter and wetter...
"I'll take care of you instead of your boyfriend..." She finds herself moaning and screaming...!

This is basically the doujin version of the webtoon "NTR Massage", but rearranged in doujin format.
The webtoon, by the way, has already had an english translation posted in this site, so you can read that if you wnat to read the story.

English (webtoon) version: https://e-hentai.org/g/2353521/eed1f0fef4/
https://hiperdex.com/manga/ntr-massage/

Same author:
https://hiperdex.com/manga/big-sister-lets-me-bang-her-hdex01/
https://comiko.net/series/79276/big-sister-lets-me-bang-her
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https://hiperdex.com/manga/sweaty-sauna-sex-01/
https://comiko.net/series/80815/konyoku-sauna-de-joshi-mane-to-asedaku-ecchi-koreijou-wa-minna-ni-barechau
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https://hiperdex.com/manga/sex-in-the-adult-toys-section/
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https://hiperdex.com/manga/welcome-to-open-sex-class-englis/
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https://webtoonscan.com/manhwa/sweaty-sex-on-the-married-womans-volleyball-team-raw/
https://webtoonscan.com/manhwa/married-womens-volleyball-club-sweaty-sex-were-being-glued-together-while-taking-a-shower-raw/

Well i remember this shit. FMC gonna break up with her boyfriend and keep going to massage parlor even know that guy just a fuckin asshole who seduced a plenty girls and she is just another hole for him. Well she did good choice who want date a guy who cant even be cuck who gonna sit and watch how she cheat on him. She just break up with boyfriend for his own good cuz she is finally get thats she is just slut who want sex and dont need boyfriend who almost about marry her.

Base +5, Fofotron +7, Kcjpunk -7

Thanks for the upload and synopsis :)

Base +19, Fofotron +7, yupokamusi -8