https://www.dlsite.com/books/work/=/product_id/BJ145672.html
As always, please support the artist and buy his works.

Since the day I mistakenly crawled into my sister-in-law at night, we have repeatedly penetrated and climaxed many times.

Takuya-kun... do it more... harder..."
--Takuya decides to crawl into Aoi, the younger sister of his brother's wife's, for whom he secretly has feelings.
He sneaks into Aoi's sleeping futon, pushes her pussy open in the darkness, and inserts his fingers into her....
Takuya can't hide his excitement as her pussy gradually becomes slippery and moist.
Takuya is not able to hide his excitement as her pussy gets slipperier and slipperier.
This continues until the end...But the person he thought he was visiting at night was not Aoi, but Kaede, his brother's wife.
Takuya apologizes and tries to run away, but Kaede takes Takuya's lips and twirls her tongue around his.
Unable to hold back, Takuya continues to suck on Kaede's nipples,
Takuya inserts his penis into Kaede's already slippery pussy and repeatedly slams his hips against his brother and sister-in-law...

Brother's wife and brother-in-law... a forbidden relationship between the two begins...