My mother-in-law had just turned 54. My wife had a small get together to celebrate. It was my mother-in-law, one of her female friends, my wife, her sister and me. I don't really remember how it started but the women tried to convince me to do a lap dance for my mother-in-law. I started to do a quick lap dance for her but they were shouting for me to strip down first. When I started I did it with all my clothes on and they told me it wasn't a real lap dance unless I stripped down. They convinced me to strip to my underwear and there I was grinding against my mother-in-law in just my undies in front of all of them now. I couldn't believe I was doing this but everyone was laughing and enjoying this including me. It was my mother-in-law who took it one step further and took it upon herself to pull my undies down. I was now exposed and at first was concerned what my wife might think. I looked over to see her cheering me and her mother on. Normally I would have quickly pulled my undies back up but instead kicked them off and danced naked. My mother-in-law's friend asked about a dance and I gave her one and then also did one for my sister-in-law. The 3 of them did have their hands on me in places they maybe shouldn't and I was worried what my wife would say later. Once all was done and everyone went home my wife mentioned how funny it was me to dance for them. She then mentioned she began to get turned on seeing me naked with them and them having their hands all over me. She specifically mentioned when they grabbed my cock she could see I got aroused and that it got her aroused seeing another woman do that to me.