"You better be careful, okay?" Sora says, and Kairi looks back over her shoulder as she swims.
"Why?"
"Well, a shark might come and eat you- rrargh!" Growling, grinning, he fakes a lunge for her pearl-pink tail. Fingertips brush fin and Kairi instantly darts back, accompanied by a noise that's halfway between a squeal and a squeak.
"Wow, Kairi, you're really ticklish, aren't you."
"Am not," she protests, crossing her arms over the shells at her chest. Then Sora dives forward and begins tickling her fins, and her scowl dissolves into a helpless laugh.
Kairi's new tail is oh-so-sensitive and strange. Each ridge of Sora's fingerprints send a shiver running through her spine. She can feel everything- her hair moving through the water, the way the currents shift when Sora breathes. The wave of sensation swells and crashes, flooding her mind and overwhelming her senses. Her head falls limp against her shoulders as a soft moan escapes her lips.
Sora's face shades to scarlet as he whirls away and resumes swimming. What was he thinking? Sure, he's a normal teenage boy; he has his fantasies. But if Kairi found out how perverted those fantasies were…
"Sora, wait for me!" Kairi calls after him. "You've got to be careful?"
"Careful?" He stops, glances back. "Careful of what?"
"Sharks." She grabs his hand and pulls him close. "Because if you're not careful, a shark might come…" Her fingers tap a summer rain's calypso rhythm down the length of Sora's tail. "…and eat you all up." And with infinite lightness, she bites down on the delicate edge of his tailfin.
That's another thing I like about Atlantica, Sora thinks some time later. Seashell bras?
So much easier to undo than normal ones.