Iris breaks rules she does not need to break. The headmistress always notices.
Francesca runs the elite boarding school with firm command. Iris is the staff member who seeks her corrections. The older woman guides the younger one with authority Iris craves. Her low voice makes Iris stand straighter before the discipline begins. Every audit pulls them into the records room where Iris bends over the desk. Each stroke comes with low praise that Iris leans into. The praise makes her return for more each time the risk increases. Their careers rest on keeping the arrangement hidden, but Iris stays for every session.
The door locks behind them.