Responses
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.
Does anyone know??
I think it's nakamura sensei
http://www.mangago.me/read-manga/kimi_wa_boku_wo_suki_ni_naru/mf/v02/c000/165/