Defining certain kinds of behavior as inappropriate, so that other characters will refuse indignantly to do any such thing.

"Virtue"
The Cloister is a room. Lady Teresa is a woman in the Cloister. Mother Margaret is a woman in the Cloister.
Attacking someone is misbehavior. Kissing someone is misbehavior.
Instead of asking someone to try misbehavior: say "[The person asked] stiffens, offended by your suggestion."
Test me with "kiss margaret / margaret, kiss me".
Test me with "kiss margaret / margaret, kiss me".
Cloister
You can see Lady Teresa and Mother Margaret here.

>(Testing.)

>[1] kiss margaret
Mother Margaret might not like that.

>[2] margaret, kiss me
Mother Margaret stiffens, offended by your suggestion.