Waifu bias aside, Tewi was undeniably more in the wrong here. You don't just go and sell someone else's stuff...
Smile, smile!
Look!
Indeed, indeed~
What's that?! This was your fault to begin with!!
Oh, man. I really wish I hadn't made that bet with you, Mokou.I didn't expect you to be that much of an idiot...Aah, geez! Please don't fight! Can't you see you're driving away the customers?!