Spring break with our mom

A few weeks ago my twin sister and I were scheduled for our annual spring break trip to Florida.
Shortly before the trip our dad was sent out of state by his company for several weeks so our mom asked if she could go with us. She knew what went on at spring break so we told she could go but not to try and interfere with our fun.
Every thing went well and we spent most of our time at other breaker’s places so she could relax and not worry about the partying and other activities although she knew we were both s******* active.
Then one evening mom let us invite five guys to our condo for dinner which mom agreed to fix. We started the evening drinking as usual then had dinner. Mom join in the drinking after dinner then my sister and I hooked up with a couple of the guy’s going to our bedrooms leaving mom with the other guys drinking.
About an hour later I returned to the living area shocked to find our mom getting it from a college guy half her age. She wasn’t aware I had returned so I just sat down watching it.
Then when the guy finished one of the other guys immediately took his place and she never lost a beat. Before it was over all three had done a train on her with both me and my sister watching
Once she realized we had been there watching she just smiled and we looked at each other and laughed.
Nothing was said until the guys had left then we teased her about how into it she had been since it had been obvious when she had at least one very intense **.
Although we knew they had all used condoms we made her take plan b the next day just as a precaution since she’s not on birth control because our dad had an operation to prevent them for having other children after we were born.
Needless to say it was a strange but interesting spring break.