https://www.dlsite.com/maniax/work/=/product_id/RJ01706813.html
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Yeah, it's one of those Swinging but actually is Netorare, bait and switch stories, however at the end surprisingly both husband and wife reject doing it again MC got too traumatized about it and his wife was being brain abused during the whole deal, receiving pleasure on her body as she watched her husband cry, after that husband says the manager send his regards, key words thaty kinda triggered a reaction on her.
The swinging was proposed by the corpo guy using his position as general manager which is far above Husband's small business so he had no other choice under the pressure and of course the manager has some kind of actuall mind hacking skill so it's in fact cheating on top of his far better skills with sex. The author explains that she still loves her husband and that it's just the "Seeds of pleasure" that took route in her body, that it's up to the reader to decide how you interpret it.

Base +23, genryuusai79 +6