You've been watching mum vacuuming the landing area as her towel keeps falling off. Your cock is liking the sight of her slim body and big tits. Once she notices you watching, she gets embarrassed. Go away step-son, stop watching her naked! but after some thought, she realises that like your step-father, you seem to have a vacuum fetish and maybe..... you'd like the thought of the soft hose sucking at your hard cock?......