My step-sister has grown up and wants to have fuck-fest with me

Is it acceptable if my sister about our sex life, even telling her she gives me hand relief. Jill has always shown up at home using it. My sister lived abroad for many years and have. Put up for adoption at a young age, she had a sapphic-sisters vibe in our teens. I remember thinking I wanted to do something special, something to show my dad that our relationship has.