[JUQ-884] A Room You Can’t Leave Until You’ve Had 100 Orgasms: I Couldn’t Make My Wife Cum, So I Offered Her Body to the Insatiable Men We Were Trapped With. Kasumi Amamiya.

Some men respond to NTR by thrilling to their wives’ adventures. Apparently, not all. But that ending. Just wasn’t expecting it, or ready for it. 
 
Did find this
 
One day, Kasumi and her husband Satoshi are suddenly imprisoned by a mysterious man. In addition to the two of them, there was Sagawa, who seemed to know something, Machida, who had a fearless smile on his face, and Reiya. The panic was short-lived, but a voice sounded saying, “From now on SEX here with everyone …” and the timer started counting down. Kasumi and Satoshi try to have sex in front of others while being urged on by the men around them. However, while Satoshi was having trouble inserting himself in an unusual environment, Sagawa and Machida attacked …
 
It doesn’t even remotely prepare a person for the ending

I love this series. First 3 were amazing, this one is ok. Needs more emphasis on the discomfort of orgasm in front of husband. She had too many orgasms in this movie that went unnoticed. There should be clear shock at the size of their cocks compared to husband. Reluctant orgasms.

In the beginning, Asagiri Jou directed

[DVAJ-459] Locked in a room where she can’t get out until she has 20 shots of semen… Even though she has sexual intercourse with her wife, she doesn’t have enough sperm, so she has to lend her body to an adulterous old man… Nanami Kawakami

with Ginji Sagawa as the one other man

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And then Asagiri Jou directed

[DVAJ-601] Locked in a room where she can’t get out until she has cum 20 times… Even after having intercourse, she still doesn’t have enough sperm, so she has to lend her body to an adulterous old man… Sakura Misaki

with Ginji Sagawa as one of two other men

/?s=DVAJ-601

And then, the director said: Let there be three. . . .

[JUQ-714] A room where you can’t escape until reaching climax 100 times – Unable to satisfy my wife, I offer her body to the insatiable men imprisoned with me until she orgasms… Ichino Aoi

Which the site linked to this by series hyperlink

And then . . . This.