It definitely involved multiple people.

Depends on what you consider kinky.

I think I am the kinky person. I am up for almost all fun fantasies & fetishes. I have an identical twin, and we have duo reviews. The 1st kinky encounter I had with a boyfriend way back when I just started my adult adventurous lifestyle makes me laugh every time I recall, so I am getting my pussy worshiped & fucked by him when we decided it was a good idea to incorporate home decor. At the time I had a huge marble elephant tusk in my living room & I fucked the tip of the tusk as he continued to worship my pussy bringing me to several back to back orgasms. lol Smile 4 me!

Good times.

By a girl or a guy or don't know

Well, I don't know if this is considered Kinky.  I have had 2 MMF sessions.  Have seen many dom's.  Maybe not real kinky, but out of the ordinary at least.  LOL.

My two favorites happened at the same massage parlor. One time it was me and the only provider working at the shop they had just moved locations so the phone kept ringing and she kept answering it, on top of that the cd player wasn't working and she seemed to be obsessed with that. I got up to take a look at the cd player as she answered the phone again I got the music playing I was standing there butt naked when she started giving me a hand job still on the phone.
When she hung up she dropped to her knees and gave me one of the best blow jobs I've ever had and sure enough the phone rang again she answered the phone and would stop blowing me long enough to talk then took me back into her mouth again as the person on the other end asked more questions. The rest of the session went like that the phone would ring she would answer and we would continue on I went down on her while she talked to some guy  she suited me up she lay on her back and I stood between her legs pumping away while she gave directions to the new place often giving the wrong directions and having to start over again breathing hard I'm sure some of the guys on the other end had to know what was going on long pauses little moans and heavy breathing.  
 Same shop years later I went to see my regular and something was wrong with the space heater in the room so she wanted to switch as I stood in the hall with just a towel wrapped around me she was going back and fourth making up the new room  just for fun as she came back into the hall I dropped my towel and grabbed her up lots of kissing and groping later I told her I wanted to do it in the hall way she said no there were three other clients there. As we stood in the hall more kissing and grinding  a door down the hall opened I just about jumped out of my skin, out walked another provider who had just finished a session it was another woman I would often see and she broke into a big smile. Now I'm standing naked in the hallway with two of my favorite providers I beg her to join us once she gets rid of her client she grabs my dick and starts rub me off and promises she will join us soon. Finally in my own room the foreplay continued until the door opened and we were joined by the other provider it was my one and only threesome and it was amazing I had to leave and come back after to tip them both really well