I was home one night while my wife was visiting her M and i got a little horny. I was the only one in the house so I went to take a shower and get myself off. I didn’t close the door all the way because I was supposed to be the only one there all night. I live with my wife and SiL and I happen to know where my SiL keeps her vibrators and I quite enjoy ass play so I found it, lubed it up, and started enjoying myself. Unbeknownst to me, she came home early for work the next day. She walks up the stairs and finds me with her vibrator in my ass and my cock in my hand. At first I didn’t hear her until she started walking closer and I turned around really quick to see her staring and starting to undress. I have had some fantasies about her but never even attempted to try anything with her before so seeing her getting undressed while I’m fucking myself and stroking made me unbelievably hard. She told me to lay down on my back so I sheepishly submit and she starts sucking my cock and using her own toy on me. Felt like heaven seeing her lips wrapped around my thick bwc. She could tell that I was getting more excited so she gets up and goes into her room to get a double sided dildo (I had no idea she had this one!) and she lays down on her back in front of me and sticks that huge dildo right into my ass then the other side into her ass. Then she grabs to vibrator I was using before and puts it onto her clit and starts moving back and forth so the dildo is fucking both of our asses. I reach down and grab my cock and start stroking while she plays with her pussy and both of our asses. We’re both going absolutely crazy at this point. She could tell I was starting to get close so she gets on top of me and starts riding my cock and shoving the dildo deeper into each others asses. I tried to tell her to get off because I was going to cum and she held my arms down and made me fill her up. She keeps riding me, using my own cum as lube until she cums too. I could see both my cum and her own squirting out of her pussy with my cock still deep inside her. After she’s done, she gets off my cock, says thank you, and goes along her way. I gotta say, I really hope it happens again.