... I'd swear this is Jakuri, except there's no way she'd let you tie her up.

So, clearly, this is Jakuri and Finnel's child. Cursed "Image board" source ...

it's that masochist girl from Rosario+

Ruby Toujou.

Her hobbies include tying herself up with chains and volunteering for electrical shocks to 'encourage' someone to study harder. She is also the main character's self-proclaimed 'toy.'

To clarify: Ruby proclaimed herself to be Tsukune's "toy". The guy himself didn't exactly get a say in it.

Tsukune doesn't have much of a say in a lot of things. Thankfully, in the comic he kicks a HELL of a lot of ass.