A Graduation Celebration Turns Unexpectedly Fun

It was graduation weekend. My son and his friends were so proud , as were I and their parents. We had discussed it and knew they all wanted to go out have some beers afterwards. None of us wanted them driving. So it was decided they would come to our house after the ceremony, and I would chaperone. They could have some beer, swim, hangout, and be safe. After the ceremony they all hung around awhile and finally came back to the house. It was Todd, my son, and five of his best friends. I'm a BBW, but was always the cool Mom on the block. They came in changed and hit the pool. I was fixing some wings and other things for them. The beer was in chest on the deck. I went to check on them and heard of them Todd, man you're lucky, I would love to fuck your Mom, she's hot! Todd said yeah me too. I was shocked. I pretended not hear. But I had gotten excited to hear that. They were all young men now. I went inside and changed into one of my two piece bathing suits and came back out and asked they if I could join them. It barely covered my breasts, and some of my pubic hair was showing, I'm natural. They all stared at me for a minute and said Yes. I got in. I made sure I brushed against each one at some point, including Todd. I felt each one get hard instantly. I got out and told them I had a snack for them to come inside and get it. I went inside. About 5 minutes later they came in. I was on the sofa naked. I told them I was the snack. Todd screamed out Mom!! I told him you wanted me, so did your friends. It's your graduation present. I said but there are rules. You all have to make me cum with your mouth FiRST. After that, you can have anything you want rest of the night. Todd went first, then each of friends. I must have cum 15-20 times over the next hour. I was exhausted. The rest of the night they fucked my pussy and my ass. I sucked each them several times. This went on all night. The next morning before they went home, I swore them to secrecy. They knew if they ever told they couldn't come back. Todd is in college now, staying at home. We still sleep together. His friends still visit. I'm still the coolest Mom on the block.