You've offered your little step sister a lift to the airport tomorrow, and she's just sorting out the last of her packing. Would you be the best step brother ever and help Miah decide on a few outfits to take with her, and in particular, a very sexy and skimpy bikini. She's undressing in front of you and your cock is getting harder and harder, and the bikini looks so fucking hot. Your sister catches your stiff dick, and she'd like to help you release some built up frustration...