Masturbating for my step-mom's hot and horny cougar friend

Your step-mom's friend Rebecca wants to borrow her shoes. Your step-mom leaves you in charge of letting her in to pick out a pair. Rebecca wants to try on each pair to see which pair is the best option. She asks you to help her put them on and when you are on the floor helping, you see that Rebecca is not wearing any panties. She senses how nervous you are and you wonder if she has any clue that you can see her pussy. Rebecca notices that you have a hard-on. She asks if you like older women. You do. You have a special affinity for cougars like Rebecca. Have you fantasized about her fat tits? You have. Will you show her your hard dick, please? Now stroke your cock for horny housewife Rebecca. Just do as you are told and Rebecca the cougar will take care of everything. You are reminded that you cannot touch one another because Rebecca considers that crossing an imaginary line.