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Following
following~
I didn't see the ending so I'm not sure but the rest of your description fits this sorta. Enjoy~ http://www.mangago.me/read-manga/zion_no_koeda/
Thank You! @Anon & @ Cleo. I had a laugh just reading it again.
If i remember correctly:
It was during war era/ solider/captain.
The uke was capture by the seme and was being torture/hardcore sex/S&M because uke was working for the other side. But, in the end they were just role playing the torture part. When they where done with the whole boom boom they went back to their post.