Senku was in a floaty water recliner thing, just soaking up the sun.

Kohaku popped her eyes a bit above the water to observe him.

"If you knock me over, I'll plan revenge accordingly."

Kohaku blew a few bubbles in frustration that she'd been noticed, then gently grabbed the arm of the floaty and pulled herself up a little so she could peek over it.

And saw that he was holding something. An ice cream bar. She'd seen Francois make some before their day at the beach and she'd tried one, and they were yummy.

She looked at him. His eyes were closed.

She looked back at the treat. It was starting to melt! A crime! It would be ruined and then no one could enjoy it!

So really, it would be better if she ate it. So it wasn't wasted.

Licking her lips, she got ready to pounce. Then—launched forward!

Senku startled when she did, falling over, moving his hand, so she only got half of the treat before it fell. In the warm water, it dissolved almost immediately.

Kohaku pouted. Her treat, gone. At least she'd gotten some before it's untimely end.

"You ate my ice cream!" cried an indignant Senku, hair now soaked from his unexpected dip.

"Ha! You weren't eating it," she countered with a smug grin, clinging to the arm of the floaty thing and kicking her feet happily.

He narrowed his eyes at her, then ducked under the water. Kohaku, caught up in enjoying ice cream, realized the danger too late.

Senku pulled her under the water and started tickling her. His plan only succeeded for a few seconds, before Kohaku pinned his arms and swam them back to the surface

He glared at her, his hair falling in front of his face. She laughed.

"Ice cream stealer," he muttered.

"I'll share," she said, then kissed him full on the mouth. Two seconds in, she realized that kissing him was, perhaps, a rather impulsive and maybe stupid thing to do. Did she leave? Swim away? Pretend it meant nothing at all?

Just as she was making her mind up to swim off into the ocean and never come back, Senku started kissing her back. He tilted his head a little, his lips pressing into hers, his tongue brushing hers. He did that thing he did where he didn't actually move towards her at all…but he sure wasn't moving away.

She pulled away and opened her eyes in time to see Senku lick his lips, then smirk at her. "Sweet," he said, looking at her mouth. "Maybe even sweeter than ice cream."

And her face blushed so hot that she had to dive back under the water to cool it off.