Vouyer Surprise

Today I went to my ex wife's house to go cut her grass and trim the bushes cause we're still civil and mature with each other & I still have some feelings for her still. So I arrive & I usually call before coming over but I was charging my phone & I walked straight to the backyard to see how it was & needed. As I'm walking around I pass by her window & see movement as I was going to bang on the window to scare her I noticed she was naked then started putting on lingerie & stockings, surprised on seeing her putting on her sexy gear at 10am I keep looking in & she goes to the other room next door so I followed hopping I could be able to see in & was in luck cause a piece of the corner blinds was broken off & no neighbors could see me as well. So being curious n seeing a free show I watched as she was laying down and rubbing her tits n pussy lips I see someone else walk into the room in leather spandex pants and a button shirt long sleeve run in & gets on top of R.C. (my ex-wife) and starts making out with her & groping her pussy n sucking her tongue like a couple of nymphos then the other person goes down on R.C & started eating her like a starving Ethiopian & she was loving it by her expression on her face. As I'm hard n start rubbing my cock I see R.C pulling down the person's pants off and to my surprise she pulls out a nice size rubber strap on cock around 8'inches 2'inches thick guessing wise & starts sucking on this girl's beige cock & deep throating it I could still remember the days when she sucked me off & she's good at it. Anywho.... As she's eating her she sausage toy I'm stroking my cock in disbelief that she goes both ways & I'm enjoying it then this mystery girl turned her around in the K9 fashion & aimed in her plump juicy honey hole & slides it right in & pump's her hard n fast as I hear her screaming n lust saying Fuck Yeah,Fuck Me good & make me Cum as her ass cheek gets slapped the girl say's I'm going to cum & R.C says I wanna taste you & they swap positions & R.C is sucking her cock & finger fuckn her as she's cumming, I finally caught her face seeing who it was, and low & behold it was my sister!! OMG... I was in Aww... Then I bumped into the wall & walked off quick zipping up and getting the bush trimmer pretending nothing happened & playing it off, I was then greeted by my ex after I finished the yard & invited me in to cool down and lemonade and sit down and she said Did you enjoy the show?