I had to go shopping today. As my husband’s sister Stella is staying with us, I asked her to watch my son and make sure he does his homework before he goes anywhere. Stella and I don't get along very well. When I come home and walk into the living room, I see Stella basically naked, her gorgeous big tits practically in my son’s face! Of course I flip out. I call her a slut. Stella, with a dazed expression on her face, finally starts to react. And she blames me! Accuses me of having put something in her beverage! I’m accusing her of seducing my son! We yell at each other. When I turn to my son, I see a big ring in his hands. It starts flashing! Stella and I go immediately quiet. It’s like the ring has power over me. It makes me take off my top. I have beautiful boobs, too, not as big as Stella’s, but perky with a nice uplift. Suddenly, Stella turns to me and starts to kiss me, first on the lips, then my tits and nipples. I don’t protest. To the contrary, I now kiss her lips and her nipples. We take off each others' thongs. Suddenly I realize that we are both without clothes in front of my son. We are shocked, again blaming each other. Before we can dress, we feel compelled to suck my son’s dick. Dazed, we go over to him, get on our knees, and I take my son’s hard, big, young dick in my wide open mouth. I suck and lick until Stella pushes me away I watch her taking my son’s cock is in her wet mouth. And man, does she know how to suck! We keep switching until he cums in my mouth and on Stella's face. And for whatever reasons, we feel like swapping his cum! Are we both natural cum sluts? Suddenly, it’s like waking up, and we find each other with cum on our faces, on our knees, in front of my son’s erect cock. And as before, we yell and accuse each other of being responsible for this. But suddenly my eyes fall on the ring. It’s not flashing anymore. I seem to remember that Stella and I started to act weird when the ring started flashing. Now I know. How the heck did he get this ring? I take it away from him and Stella and I go back to where our clothes are. I, the ever curious, make the mistake of turning the ring back on, and we are once again under its control. Stella and I, who really hate each other, start finger fucking each other. We both are very loud when we cum, and for some reason the ring suddenly stops blinking, and we come out of trance with our fingers in the others' pussy! OMG, we are both sooo embarrassed and so upset that we run out the room, away from this madness...