Portia is left mortified by a new romance turning sour but finds an unexpected ally in a rebellious supply teacher, Steph Haydock, who schools Ben on the error of his ways when STIs spread amongst the students. However, their unconventional methods attract the ire of Stella and threaten their careers. 

Elsewhere, Cat has second thoughts on her budding relationship with mean girl Izzy when the claws come out, while Stace is rocked by a revelation from social services.