Learn to swim.

Putting on a woeful face, you look into her eyes, your hands lacing around her neck. "I'm sorry Miss lifeguard… Do you think you could teach me how to swim then?" You feel ridiculous, the only reason you drowned was for attention. Her face is warm as she nods down at you, "I'd be happy to! Here, let's get in, and hold my hand okay?" She gets to her feet, guiding your tender hand in, the two of you settling at torso level, which is damn near head level for you. She tells you the proper form and how to actually kick your legs while swimming, which you of course, ignore, instead prompting to pull yourself closer to her, your submerged dick sliding and pressing against her meaty thigh. Eventually she finishes and carefully nudges you off, "Now you try okay?" Nodding, you swim a bit, nothing special, you can swim, so what? As you return to her, she smiles wide and celebratory, hopping a bit in the water, her wet chest bouncing, "Yayy! Good job little girl!" Pretty nice she doesn't care to ask your name, pretty better that she pulls you into a tight, happy, tit hug. Your face heats up between her tits as you hug back, your exposed dick happily massaging her crotch. She rests her head atop yours, "Ah, such a fast learner! Or maybe I'm just that good at teaching!" She giggles while your hands grace her rear, sliding her bikini down, your dick just about slipping on in. Your observation was right, this chick IS dumb. "Nnn, oh, a-are you excited now?" You nod, snug in her chest, "Mhmm…" Your hips pick up the pace a bit as she inhales sharply, holding your back and wincing. "So bad, little girl… O-ow…" You simply pump faster, squeezing hard and tight on her ass, your own moans spilling out one after another. She groans and pants, pulling you tight and close as your hips buck, spurting and filling her up, the white cream oozing out her pussy and into the water. You relax against her squishy body, and get so comfortable you just about drown again.