Revolting, Offensive and Nasty

One day middle aged Lexley was riding the bus home from work, and she saw a young girl of about twenty-one or twenty-two, that she knew rode the bus from the same stop, so she worked her way through the standing room crowd only to stand almost behind the girl.  Lexley  simply introduced herself and told Lexley that her name with Luna.  Lexley asked her to her house for a drink. After learning about each other and that Luna was in a relationship already, over drinks Lexley set about making diner for the two of them.  After diner Luna decided to head home.  They parted ways with Lexley telling her that she was always welcome at her place.  That is where they left it that night, and I'm well aware that this could end terribly especially since Luna was in a relationship already! Some days later Lexley was in a local supermarket on a Saturday morning, she collided with another cart.  She was dumbstruck because it was Luna and Lexley assumed the older woman was her lover.  There was that moment of awkward embarrassment before Luna said, "Hi." Luna's lover wondered how they knew each other.
Luna quickly explained the two of them commute every day on the same bus. Lexley was sure she saw a gleam of lust in Luna's lover's eye.