Hi ((((Feisty Ms Imp))))., I'd leave a bottle of lube & a note on the table. "For when you get horny... you have a hand don't you?"
I agree with Sara, get an identical lock, & switch it. That would be funny. I'd lay awake at night giggling about that one.
M 19 years, MC for 8 months, DB'd for 8 months 4 kids; 18, 15, 14, & 10 I was never meant to be a doormat. It took me years of therapy to become assertive enough to stop his abuse.