Yup

I arrive at the beach and see all the girls, except my sister, playing in the ocean. My sister, who's laying on a chair trying to get a tan, notices me and begins questioning me.

"What took you so long?" Jane asks, annoyed.

"I was uh... just helping Sara with something." I say, trying to think of a good excuse.

"Where's Sara then?" my sister asks, looking at me skeptically.

"She wanted to use the bathroom before she came down here." I reply.

She stares at me for a little bit as if she could see through my lies. Finally, she lays back down without saying anything and tries to focus on tanning again.

I decide to go into the water before she starts asking me more questions.

As I'm getting close, Maria is motioning towards me to come closer to her.

I walk through the water to where she's at, and when I get next to her, she just looks at me and smiles.

"So you fucked Sara then, huh?" she asks, while smiling knowingly.

"How did you know?" I ask back.

"Are you stupid?" she asks jokingly. "All of us can tell. Only reason your sister doesn't know is because she didn't think Sara would ever cheat on her boyfriend." she says.

"Well, she did. And she'll probably be doing it a lot more on this trip." I say, while smiling cockily.

Sara finally comes down to the beach and makes her way over to us.

"Did you have fun with John?" [Girl1} asks, teasingly.

Sara smiles and says "Tons. And I'll be having some more fun with him tonight." while biting her lower lip as she stares at me.

"Make sure to leave some room for me." Maria says. "I'm sure you won't mind that, right John?" she asks.

Who would have a problem with that? "I'd love it." I reply, trying to contain my excitement.

We all keep talking and playing in the ocean until we all get bored and decide to go back to the house. We all go out to get something to eat and when we get back to the house, we decide to watch a movie.