For me, a big part of the beauty of the ownership aspect of D/s is that I can share what is mine with others.
I share my sub and it makes me hot to do so.
The first time I shared a sub, it was with two female friends I had brought to his home. We spent an afternoon frolicking naked in his pool, drinking his booze and eating the delicious food he'd prepared and served us while wearing ridiculously frilly panties. Later, he served us an amazing seated dinner while he knelt and ate from dog bowls in the floor. Light play ensued after dinner and although I don't remember all of the details, I do recall at one point of the evening holding his face in my hands so I could watch his expressions as one friend spanked him and played with his ass while she was getting fucked by my other friend wearing my strap on.
Yeah, my friends are pretty awesome like that.
Then, during another debaucherous evening where everyone was naked and I had a female and a male sub there, I decided I wanted nothing more than to watch him to go down on her. I wanted to watch my female sub enjoying the skilled mouth of my male sub, the mouth I knew so well on the delicious pussy I knew so well.
I suggested it, "I'd so enjoy watching you go down on her."
"That would be hot," he said a little nervously.
When he didn't jump right on the opportunity, I tried working it from another angle, "You should really let him lick you. He's the most talented oral I've ever had."
"Whatever you want, Mistress," she responded, always the good girl and particularly anxious to show obedience to me in front of others, particularly him.
But it still didn't happen until I raised my voice. Yeah, I had to yell. "GET IN HERE RIGHT NOW AND LICK HER PUSSY!!! Do NOT make me tell you again!"
She and I were in bed, enjoying each other's nakedness. She was laying in my lap looking up at me when he finally came and knelt between her legs. He looked up at me with the same, soft subby adoration in his eyes as she had in hers.
But he was hesitant still. "Do it," I said sternly.
He started kissing her thighs, eyes locked with mine, while I played with her hair. "Oh Mistress," she moaned as he progressed. Watching him eat her pussy while he maintained eye contact with me, her squirming and moaning in my lap, was so amazingly hot. I could have watched that for hours.
I watched her excitement build and then ebb, her moans fading into sighs, over and over again. She wasn't cumming and I couldn't understand why. I knew from personal experience that he definitely had the skills to make her cum.
And then as I watched her sigh as she slipped from the precipice of orgasm again, I realized what was going on.
"Oh my God! You're edging her, aren't you?"
His mouth left her wet pussy long enough to tell me no and his eyes cut the his right telling me he was lying and that he wanted me to know that.
"YOU LITTLE SHIT. You're edging her!" I laughed. He knew he wasn't allowed to edge me and he was taking it out on her, the other sub in the room who had been arrogantly competitive with him all evening trying to prove she was a better sub than he. And he was winning.
I shared him again at a big party. It started with a very hot little femsub friend of mine almost shivering after a scene she'd had. I pushed her into his arms and told him to warm her up. I ignored his questioning look as he dutifully wrapped his arms around her and I went to find a blanket for us all. The ensuing snuggling turned into groping and pretty soon I was directing him to go down on her while I made out with her and played with her breasts. Right in the middle of the living room of the very large party.
I loved watching him lick her in all of the ways I enjoyed so much. I loved that he made her moan and gasp into my mouth as I kissed her. I loved that we were working together to get her to cum in a fairly public place. I loved sharing him with her.
The last time I shared him, it was in a very very hot threesome with a fairly kinky girlfriend. It began with me showing her how to do a little light CBT. She was a quick learner and clearly a little sadistic.
We ended up in a pile of nakedness that evolved into a nearly traditional threesome with everyone licking, sucking and fucking everyone else. My strap-on made an appearance, at his suggestion, and he couldn't decide which was hotter - me fucking her with it or me getting fucked with it. It was a perfect threesome where no one felt left out. There was no jealousy. Just hotness. Mega hotness.
I've learned that I'm definitely a voyeur. Watching someone that serves me pleasing someone else at my command is even hotter than them serving me directly.
In every instance I've shared a sub with my friends, there's been a sense of pride in doing so. That they are mine to share is a concept that is off the charts for hotness.