I read somewhere it was a joke about Shou releasing the little bubbles of air stuck in her pubic hair by ruffling it underwater. Dunno if that is a thing.... Nazrin attempting to do it too but keeps going because she does not understand why she cannot make bubbles lack of pubes and it straight up turns into masturbation..?
Splaaashrubscrubshruuububble bubblehuff huffrubTiger German pronunciationsquirt♡squirzsquirt♡