Marcus offers to tutor Gloria's teenage son Barney, who's struggling at school, while Jason gives him coaching in his own specialist subject, romance. Grumio is mistaken for a schoolboy and soon finds himself recruited into the under-14s boxing team.

There's a heatwave in Rome and Marcus has invested in an exciting new gimmick for the bar - ice. Grumio develops an innovation of his own in the form of a hat-parasol hybrid, which attracts the attention of wealthy entrepreneur Severus. Jason and Aurelius both join male escort agency the Knights of Eros.