Pleasuring My SIL And Fuck Her Ass

It's late at night and your wife are in bed. Your wife joking says it is clear that you are also thinking about you SIL as your wife plays with your obviously hard cock. Your wife apologizes but she is exhausted and suggests you go enjoy your SIL. You get up to go to her room. She's on her stomach in that same satin pj's. Of course, you are now imagining what you will do to her ass and the lust of having her takes over.
As you walk closer you see her bedside table drawer is a bit open then discover her toys. You get on the bed and place your hand on her back so she can’t really push up and just gently soosh her telling her to hush and just enjoy. She's absolutely joyous that you are there and using words like “yes master, please take me, I am here for you, I need you to take me to use me to have me”. You can see her need and so you spread her legs wide and just start to finger her. It is a fast and deep fingerbanging of you. The goal here is to give her that first hard and fast orgasm she's needing badly. After she cum hard on your master’s hand, she turn over looking up at you and smiling as she say, “thank you my master, thank you, thank you”. Followed by sensually stroking your cock as she continue to look up at you and saying “please master use me however you want, I need to be used for your pleasure, anything, anyway you want me, I am totally yours master”. With that you smile and grab the spanking object, turn her back over and give her ass and thighs a nice spanking. You turn again on to her back and place your fingers with her pussy juices still on them deep inside her mouth at the same time exposing her breasts with your other hand. You play with her nipples as you make her gag on your fingers. You then put on the blindfold and tell her that you are going to use her as you want to but she won't see what it will be.
Your thoughts are to first make her nipples very sensitive. First of all you take out her breasts one at a time. Fiddling, twisting, pinching them. As you have had enough you pull on her rock hard nipples.
You then place your hand slowly on her thigh and work your hand back up to her still pulsing pussy and start to play with her pussy again. You want to take her so badly. Your cock is throbbing as you give her a few more spanks. You take one of her butt plugs and put it in her tight ass. The plug will make the pressure in her pussy so much more enjoyable for you. You start to fuck Her extremely slowly. This goes on and you keep going deeper and deeper. You thrust harder and harder, with deep long strokes in and out of her pussy until she have another hard orgasm. She thanks you again thinking you are done but you take out your cock and tell her to lift her legs. Then taking out the butt plug you push your throbbing hard cock deep into her ass. This is a slow and deep assfucking, it's clearly for your pleasure and not hers but she endure it and even encourage it by telling you to use her ass for your pleasure, to take what you need from her and so she endure and even begin to enjoy it as she can see the pleasure you are getting from her. You end with the final hard thrusts as you cum in her ass. You slowly pull your softening cock from her ass. As she lean up to kiss you passionately and end with a “thank you my master, I love being yours”.
Ending is you returning to your bedroom and finding your wife who turns out hearing it all and masturbated along. And she just smiles and says so did you enjoy her? You smile and say yes and then walk over to your wife, and hold her by her hair and tell her to clean the mess.