My wife(47F) and I (47M) have been married for 23 years. We have often talked of swinging fantasies and the various scenarios that would potentially excite us. We have always been hesitant to pull the trigger or to actually try to plan anything. We really didn't even know how to approach it, and didn't know how it would go or how we would feel in the aftermath.      All that changed a couple weekends ago. We had decided to get a hotel for the weekend to get some time to ourselves before the whole Christmas rush. We booked two nights and spent most of the time in the Jacuzzi or just laying around either naked or in underwear. I got the hot tub room because I have been having back problems and figured it would help out. My wife has a friend she's known most of her life who also has back issues and she asked if he had any medicine that might ease my pain and help me enjoy our time together. (Basically, so I could screw her like the Terminator all weekend and not feel like I was dying!) I have known him for years as well and even helped him with his business in the past.     We were in our underwear when he stopped by with my gift. He stayed to chat with us for a minute and sat in a chair by the end of our bed. After a couple minutes of chitchat, my wife said she was thirsty and getting another drink. She was already a little drunk and said hope you don't mind I'm in my undies. They were little black see thru mesh with pink trim and she had a black low cut tank top that showed her sexy belly and cleavage. As she walked by him, he reached up and smacked her ass, then looked at me grinning. She jumped and giggled like a little girl. I was instantly hot! But not angry hot! Hot and bothered. I couldn't believe how sexy I thought that was, and it really wasn't anything. My wife laughed it off and the conversation continued, but that slap is all I could think of. As he got ready to leave, I decided to go for it. I just blurted out, "can I get a picture of you slapping her ass again, that was hot."  A coy look of shock and excitement came over her face and her mouth dropped wide open as she looked at me and then at him. He was more than willing to oblige!     My wife got up and walked around the bed to the corner by me and leaned over pushing her sexy ass out for him to spank. (She later, admitted she thought they were just going to pose for a picture or two for me.) He puts one hand on her shoulder and gives her a good whack. I was instantly so turned on. I couldn't even push the camera button on my phone, I was so worked up. I said, hold on do it again, I didn't get it. Another whack, and now she's giggling and laughing. Another whack, I have a couple pics and now turn on the video. He is still going and now pulls her hair and her head back and gives her two more whacks. He pushes her head down towards the bed, and then my wife, while still laughing, says, "boy, thanks rude to spank a girl, pull her hair and then leave."    He pauses for a second to look at me, and then grabs her underwear and pulls them straight down to her knees. He smacks her ass again once on each cheek, each time lingering and squeezing. After the second time, he keeps his hand there and slides down to her pussy. She let out a little moan as he massaged her pussy. I was so turned on, I could feel my heart beating in my entire body, but I was still trying to manage the camera because I knew that what was happening was special and I'd want to watch and relive it many times. He continues to rub her pussy and spreads her cheeks for the camera. Then he slides first one finger and then two into her already really wet pussy. He does this a few more times and then looks over at me and says...    I want your wife to suck my cock!  I couldn't help but say yeah as I shook my head yes. It was so hot what was happening. He then says it to her and she obediently turned around and got on her knees in front of him and started unbuttoning his pants while looking up at him with her big sexy brown eyes. She jumped straight on that cock. He was good and hard and she gobbled him up right from the start. She sucked him with all her best skills! I was standing next to him trying to film, but at the same time, I couldn't help myself and started stroking my cock. After only a few minutes, he pushed her away a little and instructed her to sit back on her butt and lean back against the bed.  She did as she was asked again. As he stoked himself now, he told her to lean her head back, open up, and stick out her tongue. As she did all this, she still had her gaze locked onto him. It was so sexy seeing her look up at him like that. As I was basking in how amazingly sexy this was, he started cumming on her tongue and chin. This was now suddenly a million times hotter than anything I had ever witnessed in my life. When he finished, she kissed his cock and each of his thighs. Even after that, they were still connected by his stringy cum from her face to his body. I handed them a towel, and they both wiped off. He put his pants back on, hugged her, gave me a handshake, and walked out. Holy shit! I am so hooked. I have always loved seeing the videos of my wife and I that we take, but seeing her in those sexual situations with someone else is so much hotter. I'm hoping we can do this again soon. Hopefully, I can be prepared and have a tripod, so I can still film and maybe participate too!    Since then, we have been so much closer. She said she had an amazing time and totally loved it. It seemed so natural, organic and there was never any stress of how is all this supposed to go down. She says I seem almost giddy all the time. I think this was a great experience for us and now she's wanting to see me with someone too. Hopefully, this will continue to bring us closer together and to bring us immense pleasure!

TLDR:  Wife got spanked, fingered by her friend, then blew him, all in front of me at hotel a couple weeks ago.