You're planning a romantic weekend getaway with your wife for valentines day! While you're wife is at the hotel awaiting your arrival, you have to stop at home first to get her present... which was just delivered! I - being your nosey bratty step-sister *assume* the package you had delivered is for me! After all.. you are taking your wife on a getaway... you wouldn't want to make your step-sister feel less special! You come home to find me, your step-sister, laying in bed wearing the lingerie you bought for your wife... but youre pissed! I'm so sorry if I ruined your weekend with wife by opening her gift! I promise I'll take it off and give it back.... after you fuck me in it :)