The word kiss was four letters, one syllable, and had one technical definition, and yet it meant a lot of things depending on what kiss it was and who gave it to you.

An Eskimo kiss (rubbing your noses together) from your parent meant that they loved you, a kind of platonic love that was one of the strongest in the world. Sidney always loved receiving those kisses from her parents as a child; they made her giggle and never failed to brighten her day when she was sad.

A kiss on the cheek from a close friend was also platonic and full of affection, but they could be used as greetings or goodbyes. Tatum occasionally gave her cheek kisses, especially when either girl had been gone for a few days and she was happy to see her. Sidney would always return her cheek kiss with one of her own because Tatum was her sister in every way that mattered.

A kiss on the lips from a boyfriend or a girlfriend was full of romantic love, a way to show affection for your partner in one of the most sincere ways possible. Sidney found that one the most interesting as there could be many different versions of a romantic, lips-on-lips kiss.

That made her think of her boyfriend Billy and the ways that he kissed her.

Whenever he was in a sweet mood (or whenever she was in dire need of comfort), Billy would give her a forehead kiss. He would press his lips against her forehead and keep them there, repeating the action every so often until a smile crossed her face. He made her feel safe, loved, and appreciated whenever he gave her that kind of kiss.

Billy's playful moods often consisted of butterfly kisses, where he would lean in so close their lips were almost touching and brush his eyelashes against her cheeks. He always did it whenever he wanted to hear her laugh and it never failed to make her heart swell, knowing that her boyfriend loved her laughter and her smiles so much that he was willing to show more of his soft and humorous side by giving her butterfly kisses.

Top-of-the-head kisses often came whenever she was feeling particularly insecure; he would just pull her close and kiss her head, usually right after he kissed her lips. Pulling her into his arms and resting his head on top of hers afterwards made her feel reassured on the days in which one of the cheerleaders who liked him got into her head and made her think that their love wasn't real. Billy's tender side always contrasted the horrible and taunting words and gave her the strength she needed to block out those girls.

The classic slow kisses on the lips happened practically every day when Billy spotted her. He didn't care who was around or if they really had time for it; he would just walk right up to her, take her face in his hands, and kiss her right there in front of everyone. He was never content with one short kiss, either; he always had to draw it out, keep their mouths connected until oxygen became a desperate need. Those kisses made her blush and a bit shy, but knowing that Billy was pouring his love into each and every kiss they shared made her feel an overwhelming joy.

Neck kisses became the norm when Billy's mood turned amorous. He would trail light, open-mouthed kisses down her neck, sending her body into overdrive and making shivers go down her spine, heat spread throughout her body, and hitches in her breathing. He made her feel desirable with those kisses and it took everything in her to resist letting him go further and learn what really made her tick.

The kisses he would give her when he was in particularly aggressive spirits are very close to his daily romantic kisses, but it was rougher, a bit more animalistic. She could feel the pressure of his lips against hers, the way that his tongue slipped into her mouth and lashed against hers, his teeth chewing lightly at her bottom lip as if he was trying to eat her. While he claimed her lips as his own, his hand would move down her waist to cup her ass and it excited her every time. If his slow neck kisses made her feel desired, his dominant French kisses made her feel absolutely sexy.

"You have your thinking face on again."

Sidney glanced down at Billy, who was grinning up at her from where he lay sprawled across her couch, his head resting comfortably in her lap.

"My thinking face?" She asked.

"Yeah," Billy made a vague gesture around his own visage. "You get this focused and kind of pensive expression when you're thinking. I call it your thinking face." The look he gave her after his explanation was nothing short of proud.

Sidney laughed and rolled her eyes. "So smart and observant," she cooed, petting his hair.

This time Billy was the one who rolled his eyes, but he didn't do a thing about her petting his hair because he loved the way her fingers laced through his dark blonde locks. "Don't mock me," he said, pouting.

"I'm not mocking you," she said, trying to be serious but he could hear the amusement in her voice.

"Sure."

"I'm not!"

"Whatever."

Sidney couldn't hold herself back; she started laughing so hard her stomach hurt, and Billy smiled. She was so beautiful all the time, but especially when she laughed like that. She was so carefree and happy.

"Seriously, though," he said after she calmed down. "What were you thinking about?"

"Us. The way you kiss me and how it makes me feel."

"Really?"

"Yeah. You make me feel a lot of different things when you kiss me in certain moods, but I always feel loved by you no matter which one it is."

Billy's smile was soft and his eyes were gentle as he stared at her. "You make me feel a lot of things, too, Princess," he said.

Sidney smiled as he rose from his reclining position, moving his body so that he was facing her. She mirrored his movements.

"Will you let me make you feel those things right now?" He whispered, leaning into her.

"Of course I will," she replied at the same volume.

Their lips touched again and just like every other time, fireworks sparked between them.

It was so interesting that one word, four letters, one syllable, and many different types of that word could make her feel so many emotions at the same time.