[Samozumo Tooru] 7 - Chapter 01 [2014-02-27][TG-BE]

[Shadow00000]

[Samozumo Tooru(さもずも融)] 7 [sév(ə)n] - Chapter 01 [2014-02-27][TG-BE]

From:

Comic X-EROS (コミック ゼロス) - Vol.16 [2014-02-27]

https://www.sendspace.com/file/aewf6i

A three chapter story, according to the magazine index the title is simply 7.

There isn't a direct focus on the BE, but it's substantial.