To address your point, yes, in that photo I posted Miri is leaning slightly to the side, which probably makes her breast more visible than usual from behind. As for Sachiko, there is a quite blatant reason why she has breasts that are visible from behind, and it isn't necessarily because they are large. Any front-on photo of her proves my implied point.
Also, please keep threads on-topic. If you think this point is worthy of a new conversation, let's start a new thread.