I'm sure she did it on purpose. Kiyoshimo should get a spanking already to learn to stay out of Yuugumo's flirting.

Kiyo-freaking-shimo. But well, they have always been cutting off Yuugumo's effort, on purpose. This time shouldn't be that different.

This series reminds me of the old RPG Teenagers from Outer Space, one of the rules for GMs of which was (paraphrased from memory), "Never let the player characters score. A, it's not that kind of game, and B, frustration is funny."