My Wife and her Sister

I am a married male in his 50's living in Canada. My wife was my girlfriend in high school and quickly came to indulging my foot fetish. She looks after her feet and always shows them off! In addition she loves to give me foot jobs after I go down on her. Her sister is two years younger and has great feet as well - slightly larger 9.5 and long toes. Well last month my SIL who is recently separated came to stay with us for the weekend. First day to my delight my wife takes her to get a pedicure and they both come home wearing flip flops. My wife then gets a call (she is an ER nurse) that she has to go into for a cover shift. So here I am with my SIL at home alone sitting on the couch watching TV. I compliment her on her pedicure and she immediately says I know you like feet Heather has told me!! I get bold and ask if she would like on of my classic foot rubs. Next thing I know her feet are in my lap and she can feel my boner so with her toes she starts to tug down my shorts and says don't say anything wink wink! She now has my hard cock between her toes milking me I was in heaven. Next thing I know she pulls down her leggings and starts rubbing her pussy that was I could take and came all over her feet. I then returned the favour and went down on her. She swore me not to dare tell but has been sending me pictures of her feet since!!