Ever since he met the Black Hearted Lolita, Shirakawa Sawahei had been betrayed by her quite a few times, and Asano Nazuki also felt she had been annoyed by Little Bai face just as much. Their grievances, both new and old, erupted together, leading to this intense battle.
However, aside from the initial sneak attack by the Black Hearted Lolita gaining the upper hand for a bit, the rest of the time it was a one-sided beatdown by him.
The kind where you're pinned to the ground and rubbed in.
At first, Asano Nazuki was quite defiant, but when she saw Shirakawa Sawahei pulling a rolling pin out of the kitchen, preparing to spank her, she started to panic a bit.
Don't ask why he didn't use his hand; it's because the force works both ways. Even when it comes to spanking a bratty kid, the genius paid great attention to the practical application of physics in daily life.
