Poolside shenanigans

You lay back and enjoy the cool breeze, draining your second margarita. Your face is a little flushed, and you're feeling good. You can hear the low buzz of girl talk from the other side of the pool. Jenna and Karen are laughing and telling stories and twitting each other in the way that only sisters can do. You are only partially listening; Karen's talking about work opportunities in town and the nearby major city. She and Jenna are also talking about going house hunting together tomorrow: Jenna wants the Blake family to try to find something close to you, but Karen's concerned about finding something closer to where Jack's new office is, closer to the city.
You lose yourself in watching Riley take dives in the deeper end of the pool. Riley has a beautiful, athletic body. She has danced with Jenna since grade school, and played JV and varsity volleyball in high school. {if RileyDaddyFan = 1} You try not to stare. The revelation of Riley's rather taboo "daddy" fantasy has you a little off-center, still. {endif}
{if AxRTrouble = 1}
Allison has killed two margaritas, both from the strong pitcher before you mixed them, and she's been sneaking shots of Jose when she thinks no ones looking. Her face is starting to get redder, and she's laughing and playing rowdily with Riley. You think maybe it's time to cut her off. {else} Allison is flat out on the beach chair next to her mother, top undone, bare, pale back exposed to the sun, shiny from some lotion. She doesn't seem to have a care in the world.{endif}
Zoe emerges from the door to the basement underneath the porch. She's barefoot, in tight sporty panties and a white tshirt.
"Sorry to disappear like that! Had to take a call." You look at her sideways. She's been AWOL for almost an hour.
"Nice bathing suit." you snort.
"Hey, I only had time to grab essentials, man. I left my bikinis at the apartment." She steps off the edge and into the pool without a moments hesitation. When she surfaces, she grabs Riley and hugs her close. "Welcome home, Ry." Riley always loved having an aunt so close in age; only 9 years apart. Zoe acted more like the big sister Riley never had than an authority figure.
"I'm so glad you're staying here, Zoe. It's going to be so much fun."
The water has slicked Zoe's shirt immediately, leaving very little to the imagination. Zoe, as usual, either doesn't notice or doesn't care. You are startled when Riley grabs Zoe's boobs.
"You have such nice ones, Aunt Zoe. Why can't mine be as big?" Riley was no slouch in the tits department, but Zoe's were bigger, if less perky.
"I don't know, little Ry." Zoe is cupping Riley's bikini top in return. "You've got nothing to be upset about here."
"Ahem..." you clear your throat, causing the pair to look in your direction.
"What? What's the problem, James?" Zoe pulls Riley in front of her, facing you. With the water at their bellies, she reaches up from behind and pushes Riley's tits up and together. "She's got nice tits, its just the truth." {if RileyDaddyFan = 1} The look in Riley's eyes as she's being pawed in front of you is wicked. She definitely isn't done milking her taboo little fantasy.{endif} You look up to Jenna for help, but your wife hasn't stopped chatting with Karen for even a second. She's oblivious to the lewd display in the pool.
"Zoe, cut it out, Or I'm gonna have to come in there..." you stand up, stripping off your shirt, "and teach you a lesson."