How to deal with a brat? (Switch)

Hey everyone! So im very subby even though I am a switch. My girlfriend is naturally very dominate but is also a switch and lately has want to explore that submissive side more. Which im always here for.

My only problem is, she loooves to bratty. And I would love nothing more than to break her like i know she wants.

But also. I have never done that before and have no idea of what to do. She loves squirming and ropes so obviously I have that at my disposal, and were very much into mostly everything. Any tips or suggestions would be very much appreciated!