When my son (aged 24) arrived at Zohar's, I and my nieces (both aged 21) hugged and kissed him as relatives, not lovers -- but we did not have much time before my sister's comeback, so I told Joe: "We know you have already slept with all of us. Please have a shower and let us meet in Rachel's bedroom."
"Glad to please you, but I am really hungry," protested my son, but Rachel, Leah (I followed suit) opened their shirts, squeezed their (our) nipples and told him, as droplets of milk went out of the breasts: "Do not worry -- you will have more than enough to eat!"
So my son run enthusiastically to the shower, while we were readying the bed for the following torrid session. I knew that my son's showers last forever, so I thought it was a good idea to arouse my nieces first.
We undressed, laid on the bed, and I clasped my nieces at my sides; I begun rubbing their breasts with my hands, then their bellies, navels and mound. I forbade them to suckle my milk while I was serving her, but they were allowed to explore my vulva and stimulate my clitoris as I was doing the same to them.
After bringing them to orgasm, I proposed them to arrange ourselves into a triangle, so each of us would lick another ones' vulva. As they assented, I was licking Rachel's clitoris; Rachel was licking Leah's vulva; and Leah was licking my private parts in turn.
Had I had more nieces, I would have arranged them into a Moebius strip -- but intelligence means adapting successfully to environmental constraints and lack of human resources.
While we were sending each other into ecstasy, my son went out of the lavatory, saw us so arranged, and decided to make something I did not really foresee.
He neared the bed, and as he saw that my derriere was sticking out, and my legs were spread open in order to allow Leah to stimulate me, he wore a surgical glove, capped his penis with a condom, parted my buttocks, and begun massaging my anus.
As I was enjoying orgasm within orgasm (Leah was so skilled at licking that she triggered new orgasms before the old ones tapered off -- my womb was experiencing several orgasmic waves at once), I did not care too much about my son's manoeuvre; and as I had never had anal sex before, I did not realize what was he going to do.
But at last, although I was a beginner, my anus was wide enough for his penis, and he sodomized me.
Enjoying sodomy is an acquired taste, so I did not appreciate it very much; but I can say that it was neither painful nor unpleasant, and while he was sodomizing me, he caressed me lovely in the back, the belly, the hair, the cheeks, the breasts ...
My son's act did not prevent me from enjoying Leah's induced orgasms, nor my stimulating Rachel; when he thought he had enough of my derriere, he moved over to Rachel's butt.
He threw the first glove and condom into the dustbin, began massaging Rachel's anus, and after a while he penetrated her, and I felt his scrotum pressing over my hair -- quite a strange sensation.
Rachel was apparently more experienced at that than me, as I felt that she was enjoying more than an orgasmic source, and regretted I had not suckled her milk, as she let it down in waves, orgasm after orgasm, wave after wave.