You invite your old friend, and colleague, along with her boyfriend over for dinner with your girlfriend and yourself. Last minute plans pop up for both her boyfriend and your girlfriend, so now it's just the two of you. Reminiscing on the past, she mentions how she's always had feelings for you but given their current relationships, it will never be.
You cut her off with a kiss, which she reciprocates, and begins her slow, or very quick decent into becoming your cock slut. She wants to prove it to you and let everyone know that you are her new DADDY ;P