"Hmm. It seems like I've grabbed your lunch by mistake." The outgoing Sandaime Hokage said as he took a bite of Kushina's delectable cooking, making Minato's up 'til then stultifyingly boring day just that much worse. "Seeing as I've already started eating it, you may take mine."

"Thank you Hokage-sama." Minato said, taking the bento that had been resting near his own on the desk as a reminder to stop and eat at some point.

"No need to call me Hokage-sama now that you've got the position." Sarutobi Hiruzen said before snagging another bite of the lunch Minato really wanted.

Opening what should've been the Sandaime's lunch, Minato took a quick bite and noted that the meal clearly wasn't store bought. Whoever had made the Sandaime's lunch was an excellent cook, nearly on par with Kushina. He would have to get their recipe for their sardine balls sometime.

"Your wife is an excellent cook." Hiruzen commented.

"Thank you." Minato replied. "If I may ask, who made your lunch?"

"Biwako did." Hiruzen replied, smiling fondly.

"Your wife is an excellent cook as well. Perhaps we should trade sometime." Minato said.

That comment seemed to bring the Sandaime up short.

"Trade what?" the older man asked, looking as if he wasn't sure he'd heard his successor right.

"Wives." Minato said.

Hiruzen started coughing hard, trying and failing to bring the bite that had gone down wrong back up. Minato rushed to his rescue, pounding on his back a few seconds before trying the Heimlich maneuver. A bite of rice hit the desk. Two seconds after it did, an ANBU medic rushed into the office, shoving Minato aside, effectively ending that day's lunch and work for that day.

"I heard there was some excitement in the office." Sarutobi Biwako said she crawled into bed with her husband who had spent the afternoon being watched like a hawk by a small team of medics that evening.

"Minato decided to prove that he was indeed little Jiraiya's student in the middle of lunch." Hiruzen said as he moved closer to his wife.

"What did he do?" Biwako asked.

"He suggested that we swap you and Kushina." Hiruzen replied carefully, bracing for impact as he awaited the incoming explosion.

Two Days Later:

"I meant in the kitchen! In the kitchen!" Minato yelled as a certain woman who was in her mid-fifties but didn't really look it pushed him back onto the sofa and began reaching for second base, completely skipping first.

"You should've said so earlier sonny!" Biwako said, laughing as the only prude on Jiraiya's Genin team which had consisted of the female peeper/underwear thief, the kid who retired to make porn films and Minato treated her like a civilian in his feeble attempts to escape.

Across town:

Sarutobi Hiruzen discreetly mopped up the blood that was flowing from his nose as Kushina seated herself on the end of the kitchen table. He still couldn't believe that his and little Minato's wives had agreed to this arrangement.

Kushina shrugged as the Sandaime put his hand on her knee, looking as if he were almost afraid it was a trap. Konoha had some pretty weird customs when it came to sex. Partner swapping had occasionally happened in Uzushiogakure, but back in Uzu such things were usually done in the bedroom. If her husband and the Sandaime wanted it done in the kitchen however, she'd do it in the kitchen.

"Is something wrong?" she asked when her current partner's hand went to her thigh and no further.

"I'm almost afraid that when Biwako comes home, she's going to punish me for cheating on her." Hiruzen replied, removing his hand from Kushina's thigh as an unpleasant vision of a very possible future hit.

"I don't think she will." Kushina replied. "Mikoto said it wasn't cheating if the spouse said it was okay when she asked me to participate in a threesome for Fugaku's birthday."

Kushina giggled when Hiruzen's nosebleed returned full-force a second later.

Ten Months After That:

Biwako frowned as she examined the baby that Kushina had given birth to. She had thought that the girl would've had the decency to use birth control during that little spouse swapping fiasco, but that was clearly not the case, seeing as aside from the red hair, the baby looked almost identical to Asuma when he was born.

"I will go and inform my husband of the birth of his son." Biwako said, carefully keeping her voice level as she handed her husband's child to the other midwife.

"Your husband? Aren't you...? I think I'm going to go outside and throw up now." an intruder who had managed to sneak in while everyone was busy with the baby said.

Twelve Years After That:

"Good luck Kakashi, you're going to need it." Asuma said as he followed the Hatake out of his father's office with the group of Jounin who had been assigned teams of potential students. There was a rather interesting collision above and behind him as two of the Jounin tried to use the window at the same time.

"That bad huh?" Kakashi said as he moved to walk with the other Jounin and continue the conversation rather than turning in the direction of the memorial where he spent most of his free time when he wasn't on a mission or in the hospital.

"If Naruto didn't look so much like our father, I'd swear that someone had cloned Kushina and turned it male." Asuma replied as he fished a pack of cigarettes from his vest.

Kakashi who had been Kushina's husband's student and therefore knew her better than Asuma who'd met her in passing a few times had winced.

"I'm not even going to give them the test, I'm failing them here and now." Kakashi said.

"Dad'll kill you if you do." Asuma said as he fished a lighter from his pocket.