Sunscreen.

It's extremely tempting, but the risk of being blue balled for the rest of the trip for not doing as you're told is a little too high right now. Stuffing the tanning lotion back into the bag, you squeeze out a dollop of sunscreen onto your hands and start liberally applying it onto Kristi's back.

Resting her cheek on her arms, Kristi sighs happily and lets you do your job, while giving you little hints as to where you can start applying more pressure, turning this into an improptu massage. As you work your way down, you completely bypass her ass and focus on her smooth, slender legs, all the way to her feet. She groans softly as you dig your fingers into the meat of her thighs, a tough knot in them surrendering under your constant kneading. "That feels good... But you missed a couple spots," she sighs, undoing her bikini strings.

Swallowing loudly, you slather your hands in lotion and gingerly set your hands on her hips. You begin innocently enough, but very slowly, start to creep your fingers under her bikini bottom to rub against her bare ass. You give it a firm squeeze before withdrawing and working upwards and along her sides, to just tease the edges of her breasts that you can reach before sliding back down again. Kristi chuckles and tells you to stop. You do so, and moving carefully so as that nothing gets exposed, she flips over to lay on her back, puts her shades down and lets you continue.

Starting all the way from zero again, you coat her arms and legs in sunscreen before concentrating on her midsection. You avoid her chest and groin for the most part, but when you feel her hand start to rub against your side, you know that you've been given the okay. Keeping the fabric between you, you start kneading her breast, sometimes softly, sometimes powerfully, just working it until you feel something start poking against your palm. Kristi's smile keeps you going as you slip a finger under her bottoms and just hold it against her clit.

Moving just that finger, you have her making soft noises while your head is constantly moving, checking your surroundings for anyone who might be a little too interested. You break focus when you feel a hand squeeze your ass. You look down and see Kristi grinning back at you. Telling you to let her go, she quickly reties her bikini and takes your hand, leading you away to some large boulders, away from the more populated parts of the beach.