Whoever flagged this apparently isn't aware that breasts aren't just balloons that sit perfectly on the front of the chest, especially when someone is grabbing and pulling them.
To be fair, a lot of artists don't seem to be aware of this either. If I learned everything I know about female anatomy from browsing large_breasts perky_breasts, I'd think this was unrealistic too.
Tagged error for the Roman numerals on the clock face. There appears to be an IIV and an N, neither of which is conventionally used in that numbering system.
Posts should stand on their own as far as tagging is concerned. The rule is to tag what you see without relying on external knowledge.
That said, this is already borderline after_sex based on context within the scene — there's a bottle of lube and a few leftover condoms, and she's enjoying a cigarette with her panties half-removed — so I won't fault anyone for adding the tag. I'd already considered adding it myself.
Regarding all the submerged tracks in anime art, my personal theory is that it has something to do with the influence of Sen to Chihiro no Kamikakushi. The train scene is one of the most memorable parts of the film, and most of today's Japanese artists would have watched it as children.
I'm not sure how many "brutal" combos had survived the bans and were still around at the time 6ED got released, but Replenish decks and Metalworker decks were still terrorizing Standard all the way to rotation.
