My (very conservative, except when she was aroused) and I talked about sharing her. She got really hot to the idea, but given her conservative nature it didn't seem likely to even happen for real. Then one night on the way home from dinner, she urged me to pull into a dance club "for a drink." Just as we were getting out, she grabbed my hand and pulled it up under her dress to reveal that she wasn't wearing any panties and was dripping wet. She'd never done anything like that before, and I was keen to just get home and go for it, but she insisted that we go inside.
Long story short, she met a guy there and danced with him several times, as we had several drinks. During a slow dance, I looked over to see him run his hand down to her ass and give it a squeeze, clearly he now knew her secret as well. When they turned so she was facing me, she smiled a wicked smile, then buried her face in his neck as she caressed him suggestively.
After, they left the dance floor and motioned for me to follow to the foyer where it was quieter. There, the guy told me "Your wife wants to go back to my hotel room with me and she said that you'd be OK with it. She whispered in his ear to correct him, that she wanted all of us to go to his hotel, which he hadn't understood, but he only had to think about that for a moment and he was down.
We made our way across the street to his hotel, and in no time at all, my conservative wife was naked on his bed, except for her sexy shoes which she left on, her legs spread wide as she fingered her pussy and held it open to display her readiness. Such a hot night watching her fuck and then dipping into the wet mess, and then watching him go again, repeat.