For Old Times Sake
You bumped into your old girlfriend at the train station and luckily for you she was willing to give you a place for the night after you missed the last train, she comes into the bedroom wearing some very sexy nightwear and you can't help but notice her perky tits! You ask her if she wore it to tease you and she admits she has, looks like you might be able to have some fun with your ex and her big natural tits.