Terra blinked.
Oh.
OH. A kiss, a physical act of intimacy that required you to brush your lips against someone else's skin, his brain supplied unhelpfully.
Terra couldn't take his eyes off the sinful curl of the sentinel's lips. It wasn't once or twice he had caught himself staring at Kai's lips without realizing, wondering how could someone's lips looked so soft and delectable at the same time and how would it feel like if he were to take it in between his teeth, and every time he had to force himself to scourge the thought. He had no idea where such a strange thought sprung up from and it made him feel all warm and tingly. True to the sentinel's words, Terra was… overwhelmed. He truly had no idea how to name what he was feeling.