Who is Giacomino Pugliese from Eleven Short Stories = Undici Novelle and what is their importance?

Giacomino Pugliese is the young man Professor Toti chooses to help by getting him a job at a bank and encouraging him to have an affair with his wife so that the two might be married after the death of the Professor. Giacomino resents Toti's kindness and threatens to ruin his plans by marrying someone else.