one teeeny detail making it worthy of the suggestive tag xD and it isn’t even bad looking at all. I drew what looked like the hint at it on the sketch so I left it in when I lined it, even fixed it a little.  
But hey, even if it rides the unpopular line between not being exciting enough to suit NSFW needs but also being enough to be limited to those areas, I for one still love anatomically correct.  
This to me is the real version of the image, but I’ll post the safe one with the tiny line there removed, too.
 
What’s got you so perplexed, Dashie?  
Maybe Twilight tried to explain something complicated to the poor girl again…