Sexual references.

A woman's back and side breast can be seen as she lays on the ground. She is fully clothed but the upper back of her dress is completely torn. It's meant to show the wounds a werewolf gave her.

Female side characters show cleavage. One of them has a large bust which looks like it's meant to be fanservice. However they're not often shown.

A snake (oscar) hops on a woman with a large bust. He then goes its way down between her breasts. Because of her cleavage we can see the tail sticking out between her breasts. Close up shot included. Sebastian then grabs the snake from beneath her dress and she wiggles in result. A lot focus on the breasts with lots of cleavage and wiggle effects in this scene. It only lasts for a couple of seconds but is discussed later on.