I convinced my Stepmom, Helena, to let me come with her to a local resort with her for a little staycation with her longtime best friend, who is visiting from out of town. Right after we checked in, we went down to enjoy the pool. They both looked so hot in their bikinis. My Stepmom's friend Andi asked me to rub some oil on her, and I took the opportunity immediately. I hope they didn't notice me getting hard while rubbing oil on Andi's ass! Then we went to the pool and i really got to see the playful side of my Stepmom. She initiated a splash fight with Andi, and the two played in the pool as if they were teens. Andi was definitely an instigator, making sexual moves on Helena, to both me and Helena's surprise. I could tell Helena was embarrassed by Andi's wild gestures in the public pool in front of me, her Stepson. But that didn't stop Andi! Finally Helena gave in to Andi's persistent flirting, and i watched them make out. By now there was no way i could get up or get into the pool, because my hard on was raging from watching these two's wild antics in the pool. I thought it would be fun to come along, and I wasn't expecting Andi to be so fun! Hopefully i can get some relief soon cause they are gonna give me blue balls if not!