Offer to go to Carly.

“I could always go and meet up with Carly instead,” you offer, backing up as if to leave.

“No, don’t!” Abigail says, tugging on your swim shorts.

“You’re awfully good at grabbing that…” you note, looking down. You get pulled into Abigail’s arms as she reaches around and grabs your ass tightly.

“Shit, I’m a horrible friend,” she mutters before planting her lips on yours. Your make out with her, meshing your lips together and wrestling with your tongues. Abigail’s body grinds against you and you can feel the heat emanating off of her. She is really horny right now! To further attest to this, she drops to her knees and pulls down your shorts. You’re already sticking out and since she’s already seen you dong, there’s no embarrassment in exposing yourself. She licks the base of your rod, fondling the balls in her palm. Her tongue slides up the length of your hardening cock until she reaches the tip, lubricating the surface area with her saliva. At the tip, she opens up and takes you in. You groan and lean against the deck. Abigail sucks you off, furtively bobbing her head back and forth.

“Ah….” you sigh, enjoying the pleasure of the swimmer diving deep on your rock hard shlong. Not only can she hold her breath for a long period of time, she’s dextrous enough to work her tongue over you like it was giving you a massage! You can’t get any harder as all your blood cells are crammed into your throbbing phallus.

Abigail pulls you down from the deck and onto the grassy lawn. The muggy weather has soaked the grass stems with dew that feels cool against your naked skin. You lay back and watch as the nubile redhead lowers her fit body over you. Her pussy is swollen and pink, and her labia lips are spread open. Abigail eases herself onto you with a soft exhale. You gasp sharply as you feel her tight pussy squeeze its way over your pole. Her thighs rest on your sides so you can rest your arms over them and feel her smooth ass.

“Nnghh….” Abigail moans as she rocks on your body. You can feel the leg control as muscles tighten and relax over your hips. Her ass cheeks flex and relax as well. She takes your hands and pulls them up to her breasts. Her nipples are rock hard but her petite breast are soft and plush and big enough to get a handful of. You cup her breasts as she holds your hands in place, then she starts to pick up the pace.

The swimmer’s body strokes back and forth, up and down. You moan, feeling your cock being taken for the ride. Soon, Abigail’s body is bouncing as if she is a jockey making chase. Her body lowers enough for you to lean up and suckle on her tit. She gasps, then moans at the attention. Your hand fondles a breast while you suck on the other as the redhead rides you ragged.

Both of you are breathing hoarsely at this point. A sheen of sweat has built up like a second skin on your bodies from a combination of the hazy warmth of the evening and your physical exertions. You can tell you are ready to cum and let your partner know through a series of grunts and tensing of the muscles. The sexy redhead on top of you acknowledges your condition and tenses up herself, squeezing her knees against your sides. She keeps pumping her body onto yours though, juicing herself with sticky, wet slaps of her pussy against the base of your dick. She takes your hands into hers, entwining your fingers together while maintaining her fuck rhythm. She straightens her arms and stabilizes herself against yours, which are bent at the elbow, holding her up.

“Ready?” she asks, huskily.

You squeeze her hand as an affirmative.

Abigail’s body goes into a higher gear and you immediately tense up! If it weren’t for your sex juices acting as lubricant, you fear there would be some carpet burn! Abi grinds into you hard! You can feel the grass being crushed against your backside. Abigail’s entire body jiggles and shakes as she rapidly thrusts her hips, pushing your cock in as deep as it will go. You feel her fingers clench down on your hands. You squeeze back. Both of you start to tremble at the same time.

A gush of cum explodes inside the redhead. She gasps and shakes, taken by surprise. She holds her grip and rides it out, shivering with pleasure! She slaps her ass on your thighs as she gingerly humps your body some more, squeezing out every last drop of pleasure from your body. When she is done, she lets out a satisfied sigh and lays on top of you, breathing heavily.

It takes a few minutes for you to recover. Abigail pulls herself off your softened cock and lays by your side. She gives you a kiss and smiles.

“We’d better get back,” you murmur to her. The others probably know what you two were up to, but it would be selfish to keep them waiting. Abi agrees and does the best to clean herself off with the grass. You watch the naked young woman roll around in the grass and rub herself. She stops, noticing that you are staring and gives you a playful kick to get you moving. She snickers as you go grab your swim trunks and get dressed.

When you return to the deck, you find Carly and Lynn sharing a sun chair, chatting among themselves with amusement.

“Hey, you two! About time you finished up!” Carly calls out.

Abigail looks relieved that her friend is in a good mood. It’s a good thing Lynn was around to keep her company.

“Oh la la! What have you been up to?” Lynn teases, leering at Abigail’s naked body. Abigail blushes and rushes over to her discarded speedo to put it back on. You all dress back in your street clothes and head back.

After Carly and Abigail are dropped off, Lynn drives you back home.

“So, challenge complete! Congratulations!” Lynn says.

“Huh?”

“You got Carly to strip for you. That's a mission accomplished!” Lynn states.

“I didn’t even get to see her naked,” you say.

“Yeah, your loss. She’s got quite the body!” Lynn replies. “So, are you ready for your next challenge?”