WHAT !?!?!? KOGASA IS BEING BULLIED EVEN BY BY MYSTIA !?!?!? I hate to say that, but.....Tatara-Chan is completely hopeless..... (that's why we like her (-w-)(-w-)(-w-) )
given how the picture looks at, i can only give 2 conclusion. 1) they're being forced to do this. 2) mystia has a crush on kogasa. AS for mystia trying to troll kogasa, i find it abit far-fetch considering that kogasa and ichimi are so-far the only touhou characters who never make a hurt-face after being defeated by the main characters , implying how tough they are.