Wait, whats up with the strangely erotic tooth brushing?

79248cm/s said:
Wait, whats up with the strangely erotic tooth brushing?

It's a parody of a scene in Nisemonogatari (in the anime, it's episode 8). Araragi Karen is voiced by Kitamura Eri (same seiyuu as Yui).

btw the left one is a parody (too) of a scene in kami nomi zo shiru sekai (in anime,i forgot the episode) Shiomiya Shiori is voiced by Hanazawa Kana (Same seiyuu as Tachibana Kanade) CMIIW