Whatever Mori was saying always went completely through one of Dazai's ears and immediately left through the other, and it's not that what the other was saying held no importance whatsoever... wait, no... it is exactly that. He already knows about it, it's not important.
However, what caught his attention was a fluffy shoe hitting his shin under the table... he spotted that stupid slipper that child was always wearing it and a sigh escaped his lips, is this his karma for always poking fun at Chuuya? Seriously Mori, you'll pay for leaving him to babysit.
"If you don't want me to kick you twice as hard, you better stop." That should do it... after all, don't dish if you can't take it in return. Then again, he can't really hit twice as hard... it'd be bad if he broke the kid's leg... well, he'll just put Kyuusaku in a high shelf and leave him there instead, that worked the last time. "What do you want anyways? I swear, your attention span is the same of a housefly."