Relax, Outis-san. People are just havin' fun. Ya never done a challenge like this before?

[Her embarrassment was palpable, but it was understandable. Not a lot of people really feel comfortable doing challenges that seemed unconventional, and Rinne-- well, he liked to tease.]

The ass has one of the biggest muscles in the body, so ain't that the best reason to test out its power?