Head girl Tamsin is back in detention, this time for being caught twerking at break time! Headmistress, Miss Riley is disgusted and has decided Tamsin deserves a nasty gunging! To begin, Tamsin shows off her twerking skills for you by doing a very bouncy dance--Wiggling her bum and boobs! Miss Riley then orders Tamsin to take a seat in her gunge tank and explain to the school what she's done! It's then revealed that head girl Tamsin must play a game, where she must twerk for set amounts of time--However if she fails, she faces a very nasty punishment--A tank load of sloppy school lunches! Miss Riley relentlessly releases tank loads of yellow, orange and purple gunge all over poor Tamsin, who squeals at the sloppy cold mess. Tamsin's school uniform is so messy she has no choice but to take off her skirt, bra and tiny thong, leaving her naked in the gunge tank! However, Tamsin takes it upon herself to get some revenge by twerking her gunge covered butt right in Miss Riley's face. She ends up enjoying herself so much, she spanks herself and rubs the slime all over her nude body--Knowing full well Miss Riley is loving every moment!