Because I see no reason to do so. Or maybe I missed something? Tell me please if so.
Who is Shawn? A local devil from Kyoto arc, who acts from the shadows trying to conquer 2-C girls and fails in several cases, for example Eri's. And who also is supposed to be Eri's fiance.
I fail to see how he can influence plot development now or later. Please tell me in case I'm missing something.