"Naruto… what's wrong…?" Sakura moaned as the waves of pleasure originating from her nether regions gradually diminished in intensity. "Why'd you… stop…?"
"Hey, d'ya think my dad's still alive?" Naruto blurted out. "D'ya think we'll find him outside if we look long enough, ya know?"
In a rather predictable turn of events, Naruto started getting horny watching Sakura's magical breasts growing and shrinking repeatedly, and since she was always in the mood to get frisky, they had swiftly returned to his new flat for a rather steamy evening, much to Karin's dismay…
…and that was how Sakura had ended up lying on her side in Naruto's bed, one leg sticking out in the air to grant him passage.
"Can we, like~ ooh~ focus on the task at hand~ ngh~♡?" Sakura gasped as Naruto hugged her shapely thigh and started moving his hips again. "The last thing I want to be thinking about during sex is your dad… or do I?"
They weren't that far apart in age, since Minato had spent the last few years of his life being dead, and he was rather handsome…
"I'm gonna—"
"Not yet!" Sakura gasped, her toes curling in pleasure. "Don't finish yet, I'm so close~! Keep thinking about your dad!"
Naruto's pumping gradually slowed… and then accelerated again as he successfully edged himself, returning to a comfortable pace. Sakura's immense, O-cup sized breasts rocked back and forth on her rib cage like pudding with each stroke.
"It's just that the house is awfully empty," Naruto sighed as he reached out to grab Sakura's fat breasts, his fingers sinking deep into the springy flesh. "Without Dad around, ya know?"
"I'm sure he'll turn up eventually," Sakura said grumpily. Naruto and his stupid Talk-no-Jutsu… this was supposed to be sexy time, not talky time! "Either that, or…"
"Or what?"
"I forgot."
As long as one had enough chakra, the Flying Thunder God Jutsu could be used to travel between dimensions, so there was no reason for Minato not to have returned yet; unlike Tenten, whose chakra potential was ordinary at best. It had been a week, which meant that most likely, Namikaze Minato was dead again... either that, or he had turned traitor. And since it was unthinkable that the Fourth Hokage would ever betray the village, by process of elimination...
Naruto's body suddenly tensed.
"I said not yet! I'm not finished yet!" Sakura squealed as she locked her legs around his waist, stopping him from moving. "And take your hands off my boobs! You always cum early when you're holding on to them!"
Sakura summoned her chakra and zapped him with a little spark of lightning before allowing him to resume pumping.
"I can't help it, it feels really good inside you, Sakura-chan!" Naruto gasped, tearing his hands away as though stung by a bee. "And it's your fault for squeezing me so hard down there! You're gonna ring me dry, ya know?"
Sakura's breathy little moans were really sending him, and after a week of inactivity, she had gone soft all over, which, in his opinion, only made her all the more pleasurable to hold and squeeze. And thinking she would be pleased with the compliment, Naruto told her as much.
"I know you didn't just call me fat," Sakura said coldly. "I know I weigh multiple tons, but the fat is all in the right places… ya know?"
A chill ran down Naruto's spine.
Deep down, he knew that the safest thing for him to do was laugh off his words as a joke and change the subject, but at the same time, the evidence was overwhelming. His girlfriend was still quite muscular underneath it all, but her normally athletic and slender figure was beginning to grow fluffy all over, developing love handles and the beginnings of a gut... and her thigh gap was closing as well.
Sakura yelped as Naruto pinched one of her flabby folds.
"What the—"
"See?" Naruto said helpfully, squeezing her a few more times for good measure. "Bloop, bloop."
With a few hand signs, Sakura deflated her breasts to see what was going on downstairs, and much to her horror, found that Naruto was indeed correct. She was beginning to get fat, but this didn't make any sense, she had only been lounging around for a week! It wasn't normal for humans to put on weight this quickly. She looked like she'd gained ten kilos, and that was just in her thighs!
"GYAAAAAHHH!!!"
It was this damned Akimichi clan breast chakra doing this to her, wasn't it!? She needed to get rid of it as soon as possible... go on a diet, or go for a walk, or all of the above!
"Tomorrow morning, we're definitely going out to look for our comrades!" Sakura declared. If she didn't get some exercise soon, her body would start catching up with the size of her breasts! "But for now, we're doing at least a few more hours of bed exercise before we go to sleep!"
Sex burned a lot of calories, which was just what the doctor ordered... and Sakura was the doctor, and she said yes. Whenever she had her annual medical check-up and was asked to tick the box indicating her sex, she would write next to it, yes please.
Well, Sakura had actually only done it once, because the only time she'd tried it, Lady Tsunade had made her do an inventory of the entire medical department's medical-grade cotton balls as punishment for fooling around.
There had been twenty thousand, incidentally.
"All right!" Naruto cheered. "But can you make your boobs big again?"
"No problem, but I need to work off a bit of this flab," Sakura said brightly as she infused some chakra in preparation for the Transformation Jutsu. "Wanna do it with the Senju Tsunade?"
Kunoichi rarely became overweight because moulding chakra drew physical energy directly from their cells, solving the problem of excess energy at its source. It was only when they retired, which had been rather rare until now due to the risks inherent to the profession, that they would start gaining weight if they continued eating portions as large as those they had consumed while still active.
"Eww, no way!" Naruto said, wrinkling his nose. "Granny Tsunade looks like a wrinkled prune!"
And now he was soft again.