are the letters PDA a prompt?
I took them to be, so here goes... Since Tom and Kristie aren't together, I'll use Tom and Abby.
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"Tom..." I moaned as I felt his tongue poke out from between his lips to leave an open mouthed kiss along the nape of my neck. "We shouldn't...." He wedged my body between the trunk of the tree and his hard lithe body, urging my thighs apart with his knee. He pressed his erection against my center, his desire for me feeding mine for him. "Park... children..." His hand was already buried in the cup of my bra, kneading the flesh, tweaking the nipple, driving me mad.
He thrust against me, covering my mouth with his hand to keep me from crying out. "Quiet, love. You'll draw attention." He nibbled along the hem of my v neck t-shirt down to the start of my cleavage, licking that spot, his spot. He thrust again, a shot of pleasure forced another whimper into his palm. The songs of the birds overhead masked my sounds of lust, as Tom trusted the trees to disguise our public display of affection.
Before I knew it, Tom had one hand within the confines of my jeans and knickers, and was confidently stroking my wetness to my distended clitoris, aching for attention. "I've always wanted to make you come in the park, my Abby." I braced myself against the bark of the tree, trying not to embarrass myself in public, but desperately wanting to find release after all the teasing. How did a simple makeout session between us always become not so simple? Swiping, brushing, sweeping, circling his thumb along my chaos point, he swiftly found his treasure at the end of the rainbow. He made me come in the park.