Just then Jennifer came back wearing a bikini that was even sexier than her costume. She eyed me up and said "So, since it looks like you're ready, follow me."
The walk to the pool was horrible. There I was, walking behind the most gorgeously thonged ass I had ever seen, while my dick was getting bigger and bigger by the second. When we got to the pool, the other couple was already in splashing around and I couldn't wait to jump in and hide my bulge, so in I went.
Jennifer joined me and we splashed around until the girls came back. My erection had subsided but not for long. Sarah and Beth were both wearing very hot thong bikinis. They jumped in and joined in the splashing. Things calmed down and Jennifer and Sarah swam away leaving me and Beth near the corner.
"I can't wait to get you home," Beth said as she pulled me closer and started to rub my growing erection. We began to kiss as I caressed her bare ass cheeks. She then slipped her hand inside of my costume and wrapped her hand around my shaft. I was about to tell her to be careful, or I would shower her hand with cum when Sarah and Jennifer came swimming over with the trunks of the other guy. He was chasing them and his girlfriend was doubled over laughing. Beth let go of my cock in time to catch his trunks.
"Keep away!" yelled Jennifer as Beth dove underwater, leaving me in the corner of the pool with Sarah and Jennifer closing in. I started to chase after Beth, not only because I had to help the guy out but because I didn't want them to discover my hardon.
"Don't think about getting those back or you're next," Jennifer warned as she and Sarah created a block leaving me trapped in the corner of the pool.
"Maybe we should take his now too," Sarah joked when Beth let out a yell. The guy caught her and was trying to get his trunks back. Jennifer took off to help and Sarah turned to me and said something that I had forgotten. She said, "He may be getting his trunks back but remember, yours are going to be see through all night." She winked and took off after Jennifer.