My guess here Tewi told Reisen that Eirin was looking forward to facing her or something along the lines of disappointing Eirin. Truth and honesty can hurt so much at times.
Steak said: Wiki says that Tewi is one of the few benevolent youkai running around, so why is she always playing tricks and insulting others?
She's benevolent to *strangers*...
Because you'll tarnish the Princess's image with your villainous acts...I only wanted to tease her a bit...*GU-SHUNK*!That's not true.For Lady Yuyuko, am I nothing but an eternal novice?When I look at her, I can see that she cherishes you.Episode 175: Too MuchFrom the Artist's Pixiv pageAh, no.She had a lot of praise for your match.Although such troubles are a luxury.Overly EffectiveAh, hey hey.This'll only be until the competition is over.Demon!!. . . you're excommmunicated!Oni!Reisen . . .
I have a message from Master . . .Sorry 'bout that...didn't think she'd cry...Moon people sure are cold-blooded!