The name of this manga please!!!!!

I think it's Sekaiichi H. or Junjou R.

The uke looks like either Misaki from JR or Chiaki from SH but the seme is neither Usagi san nor Hatori san. So I'm thinking it's some kind of doujinshi written by Nakamura sensei.

I'm pretty sure the use is Misaki from Junjou Romantica, the other two are also a couple in JR the seme (the other black haired guy) us Nowaki and the one in the doorway is his uke (though I forget his name.) I think this is just an extra drawing and I don't believe this has happened in the manga before. But, ummm so yeah. I believe all three are from JR.

Oh so it's adultery!? XD
I seem to recognize the characters but refused to accept cause the idea cheating seem far fatched in original story :v