It helps if you've experienced it or not. Are you trying to make the kiss romantic and sweet or short and sloppy? Here's an example and I hope it helps ^ ^:
The hot sun beat down on them, reflecting off the white sand and half blinding Miranda. Ken grabbed her by the hand and sprinted for a clump of palm trees near the cliffs, about ten yards away. The sand was blistering their feet.
Miranda and Ken were both panting once they reached the trees. They fell down together into the powdery sand, wallowing and clutching at each other, laughing like giddy grade-schools.
Once Miranda's eyes had adjusted to the shade, and she could see once again, she propped herself up on one elbow and noticed that Ken had gone quiet and was staring at her. It made her self-conscious, but she was unable to look away once their eyes had met.
Like every other girl in Turtle Cove, Miranda had long admired Ken's surfer boy good looks. His tanned skin and golden-green eyes, the sprinkling of freckles across his nose and sandy blond hair were to die for. But lying this close to him, she couldn't help but notice for the first time just how muscular his shoulders were, and how lush his lips looked. She let her gaze slip lower, to the rest of his body she had seen a thousand times, but which seemed so utterly different today.
What was she doing? Ken was her best friend. No way should she have been noticing how his abs rippled down into the waistband of his swim trunks.
"Wow, when did you get these?" Miranda teased, reaching down to run her hand along his impressive six-pack. But Ken caught her hand in his just before she touched him, startling her.
When she looked into his eyes once again, his expression was intense, almost threatening.
For a moment, Miranda thought maybe he was angry, but before she could ponder it further, he yanked her to him and covered her mouth with his in a hungry kiss. She responded immediately, surprising herself. His mouth was so warm, the caress of his lips softer than she could have imagined. He tasted tentatively with his tongue, and Miranda opened her mouth with a low moan.
Suddenly, Ken pushed away as if he'd been burned. He jumped up off the sand and started pacing back and forth with his hands on his hips.
"I'm sorry, Miranda," he said in a strangled voice. "That wasn't right."
"It's okay," Miranda said, looking at the ground. She was afraid of seeming too eager or disappointed. In fact, she wasn't quite sure how to react, to the kiss or to Ken's sudden show of regret.
"That wasn't right," he said again. "Come on, let's go find the others."
He took Miranda gently by the hand and helped her up, avoiding looking into her eyes. As they made their way deeper into the trees and up the hill, Miranda couldn't help but wonder if Ken's heart was beating as fast as hers, or if he was feeling anything akin to the hot fire of desire that had settled in her belly.
I have to give credit to the source because I didn't come up with it on my own P Heh, good luck