Explaining the flirting scene between Tanjiro, and Shinobu where Mitsuri catches them in the toilet

A couple of young anime enthusiasts Tanjiro and Shinobus decide on sneaking in the girls’ bathroom, which they get caught in by Mitsuri. Al dente shower scene they share long deep kisses and slowly and uninhibited make love to each other in the embarrassment of riches; nasty sex, oral sex, close-up.