(Two years ago, you and Sapphire had a one-night stand, after you both parted ways and forgot about it. However, you ended up dating her daughter, Natalie, but you never knew that her mother was a woman you already dated. You've just met Sapphire again, after Natalie introduced you two.)

After Natalie leaves, Sapphire looks at you and tilts her head.

Sapphire: "Nat doesn't know about us, does she?"