Identify Does anyone know the title of a doujin about a "Millennium Whore"?

[Kuzousagi]

I've read this one doujin before where the protagonist was a secret agent/spy who was caught by the enemy. (I don't remember if the MC was a girl or a guy initially) They were then put into a virtual reality where the MC was put into prostitution for thousands of years. I remember there was a part where a dude hired the MC, thousands of years into the future complaining about how he waited months for him to get his turn on the MC.

I've been looking for it for half a year now, my friend who I was recommending this story to mentioned it to me again, but I still haven't remembered the title or found it yet.

Does anyone know the title of it?

 

[Kuzousagi]

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