I Owe You One
L.E. Chamberlin

Later, on her way to the bus stop, Rory's surprised again when Cari offers her a ride home and then proposes spending the evening together at her place. Rory readily accepts the chance to spend time with the woman of her dreams. Despite the obvious age and socioeconomic differences, not to mention that she is obviously there for rebound sex, Rory decides to enjoy the opportunity and show Cari that youth does not necessarily equal inexperience.
When she makes the decision to put her own pleasure in the Kitchen Goddess's able hands - something she's never trusted to another partner - she is surprised again by the ease with which the sultry older chef satisfies her. What was meant to be a meaningless romp between two co-workers turns more intimate than either imagined.
But an ill-timed phone call from Cari's ex threatens to mar their Valentine's Day fun. After the reset button is pushed on their night, the decision is up to Rory to take her shot or let her fantasy ruin her reality. Rory makes the most of her time with Cari and they agree to apply the "Vegas Rule" to their delicious one-night stand.