I was doing a bit of soul searching while working with my hands yesterday and this came to mind.
Some twenty years ago, I worked away from home. My partner would often have a friend visit and they would spend time chatting, had dinner together, sometimes the friend would even spend the night over. It wasn’t uncommon for me to call in the evening to talk a bit with my partner and find out the friend was at my house.
Nothing ever happened. My partner is not bisexual and we are stricktly monogamous. But thinking is not acting and having an imagination is not a crime so at some point, and because there was such a good relationship between the two, I started wondering how would things work in a relationship between three people.
I’m basic, I admit.
Would I act on it? No. But the fantasy stuck. And as strange as this might sound, I wasn’t exactly lusting after the idea of having another sexually available partner, although that was a point of interest; what fueled the fantasy the most was how the women were so in tune with each other. It was nice to know I was away but my partner wasn’t alone.
I’m home today but sometimes the idea floats to the surface of my mind.

Being branded or microchipped - cold branding is apparently a thing and fairly safe/temporary, so I might try it someday.
I have quite a few fantasies that I wouldn’t survive, but sometimes I’ve thought if I was diagnosed with something terminal, getting fucked in a guillotine would be so fun.
As a dom, I like the sound of you. However I wouldn’t want you in a guillotine! Maybe in a pillory instead?
A pillory does sound very fun - I want to learn some basic wood working to make some stocks.
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Institutionalized chattel slavery is really my biggest fantasy. Being microchipped would be “officially” being registered as the property of another person.
I like the idea of being somewhere in between pet/livestock/object, and a microchip works well for that.
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You made me research on cold branding and it can be very much permanent.
One of my wives is very into petplay. I have just recently been thinking about getting her a microchip. I could get a human-implantable chip from Dangerous Things, then copy the FDX-B information from a pet microchip, so I could get her ownership information registered with the manufacturer’s database. I think she would enjoy it, if she could get over the size of the implantation needle.