[Sailor Enlil]

Originally Posted by mdauben

Hehe! Can't wait to find out what that is all about!

Well, I swung by one forum that looked into it and according to them

Spoiler:

Winding the key on Chachamaru has a similar effect to doing so to Robo Miharu and Minatsu Amakase in the Da Capo series - it gives a feeling akin to being sexually aroused (she says something like "It.. feels good"). In fact

Spoiler for 3rd row panel on page 17:

when Negi decides to wind her up as fast as possible, he inadvertedly says something along the lines of "I'll screw you until you feel great!"