"Thank you so much for having us!"

Rin gritted his teeth at the sound of his baby sister's voice. They had their own pool—why did they insist on encroaching on his pool? Cold weather and rain were no excuse for slacking off.

"It's a pleasure to have you here."

Something about Mikoshiba's tone caught Rin's attention. It sounded almost—no. He turned and narrowed his eyes, evaluating the captain's stance. He stood pivoted unquestionably toward Gou, and he had his arms held wide.

But Mikoshiba was friendly enough with everyone. He wasn't necessarily—

"You can practice here any time you like!" he said brightly, taking Gou's hands, and she smiled up at him.

"You can really tell that this is a prestigious school's swimming club," Gou said, and Rin watched in horror as she openly eyed the scantily clad men standing around the pool. "All of you really look the part."

"Ah, well," Mikoshiba let go of her hands and turned away just enough that Rin caught the blush dusting across his face. "I, uh."

"This is the worst flirting I've ever seen in my life." Rin kept his voice even despite the discomfort twisting around his stomach. "We're here to swim, not hit on my baby sister."

"I'm not here to swim," Gou said, peering over Mikoshiba's shoulder. "Does that mean that I can flirt with him?"

"I—that—" Rin stammered, then covered his face. "You've gotta be kidding me."

Nagisa paused while pulling off his hoodie. "I think that Gou-chan and the captain would make a great couple!"

"Right?" Gou said. She shot a poisonous smile at Rin. "I don't see why my big brother has to butt in."

"Now, now," Makoto said, holding up his hands to pacify the group. "It's natural for a big brother to have concerns even if his little sister is responsible and can take care of herself." He smiled at Rin, who refused to return the favor. He sighed, still smiling. "We'd like to have some time to practice, if that's all right."

"Yes, of course." Mikoshiba coughed. "Nitori, queue them up."

"Yessir!"

Mikoshiba glanced back at Rin, then turned to Gou. "Were you just teasing?"

"Oh, no," Gou said. "I'd love to go out with you sometime."

Rin pulled down his goggles and snapped the strap. Time to take his aggression out on the water.