pencil and story: Mancini

Erotic tale set in a girls' boarding school run by the nuns, in an indefinite period.
Also this time I cannot be precise in the plot, since the book is in Dutch.
Catherine has just arrived at the boarding school and is introduced to the other students by the nun who welcomed her.
Anne immediately becomes fond of her and joins her that same night, introducing her to sapphic pleasures.
Julie, Anne's friend and lover, introduces her to the handyman, whom they secretly visit during the night.
The man is a bit retarded and does not speak, but he is also very gifted.
Catherine can visit him too, but not wanting to lose her virginity, she gives him her ass.
The desire is too strong and in the end she also offers him virginity, but she is discovered and punished.
After the punishment she is again consoled by Anne.
The nun catches them again and this time Catherine is expelled.