Exposed

We were at my wife’s parents for a weekend to hang out with them and use the pool and just relax. Before going to dinner I decided to hop in the shower, my wife was in the hall bathroom so I used the one in her parents bedroom. I had left my clothes on the bed and took a shower. After I was done I hung up the towel and walked out into the bedroom to find her mom standing at the closet. She was still in her swimsuit and I was completely naked. She turned and looked at me and saw everything. I keep my body shaved and am in good shape but I have a very small penis. She looked at it and immediately started giggling. My wife and I do a lot of small penis humiliation in the bedroom so hearing her laugh turned me on and I immediately got hard. This made her laugh even more as she saw her 6’ tall muscular son in law with a hard little 3” dick. She then left the room still laughing as I stood there humiliated.