After lunch on day 457, Kenshin had just finished training Karin and Makoto when a flustered Hitomi burst into the gym, delighting him immensely.
"This will definitely work!" she declared joyfully, prompting Kenshin to raise an eyebrow in surprise, awaiting more.
"I think I found a way to master the 'flower of longevity'," she said more quietly, so the girls wouldn't hear.
Kenshin nearly choked in surprise and blushed deeply, recalling one of his most shameful moments. The previous evening, he'd been forced to transmit Keiko's sensations into Hitomi's mind, feeling utterly awful.
"Come on, stop sulking..." she whispered tenderly, enveloping him in her arms and pressing his face between her breasts.
"Better not remind me!" he said with a shudder, and laughed.
Though awkward, such situations paled against real problems, so dropping the foolishness, he focused on the main issue.
"What's your plan this time?" he whispered softly, hugging the busty, pregnant mommy from behind, pressing his manhood against her curves.
"Mmm... This time it'll definitely work. I learned to accumulate chakra in these tenketsu, and I'm sure when 'it' happens, everything will occur naturally," she replied with a slight smile, rubbing her ass against his swelling bulge.
"You're not thinking of doing it right now, are you?.." Kenshin asked in surprise, stroking her slightly bulging belly.
"Of course I am! During pregnancy, I want it even more!" she declared, moving his hands from her belly to her breasts, moaning sweetly as he found her swollen nipples.
They got so carried away with foreplay that they forgot the two girls in the gym. Karin could only blink in astonishment, watching her beloved father caress Hitomi, while Makoto pulled at her tank top, looked down, sighed enviously, deciding she'd never catch up to the Nakayama family's chief healer.
Kenshin couldn't miss the girls' intrigued feelings, cleared his throat, and stepped away from Hitomi. He barely concealed his massive bulge in his pants, but telekinesis helped greatly.
He quickly announced the training's end and hastily left the gym with Hitomi. He barely restrained his urges, but once outside the door, a sharp smack sounded, and Hitomi squealed delightedly, rubbing her ass.
"Why was Daddy acting so weird?" Karin asked, tilting her head slightly.
"I know! But I won't tell!" Makoto teased, sticking out her tongue.
"Tell me, pretty please!" Karin said, sensing she was on the verge of a huge secret.
"Fine, but Red sleeps with me for the next week!" Makoto said after thinking.
"Nooo! That's not fair!" Karin declared, hands on hips.
"Then I won't tell!" Makoto replied, turning away.
"Fine! You can sleep with Red for a week..." Karin grumbled discontentedly.
"Kenshin and Hitomi are going to fuck!" Makoto whispered conspiratorially, adding: "Shh, don't tell anyone you heard it from me!"
"You tricked me! Everyone sleeps, that's no secret!" Karin exclaimed indignantly, puffing her cheeks.
"They won't just sleep, they'll..." Makoto whispered dramatically, leaning to her friend's attentive ear and spilling everything.
"Ah! No way!" Karin exclaimed in shock, widening her crimson eyes.
"Yes way!" Makoto said proudly, nodding.
Learning the shocking truth, Karin was utterly stunned and refused to believe adults did something so silly and incomprehensible. But after thinking, she recalled the foul-smelling men guarding her and Keiko often inviting shady women into rooms, and once little Karin caught them in a storeroom with hiked skirts and pants down, but hadn't thought much of it.
"I still don't believe you! You're a liar, and my daddy's the best!" Karin said, sticking out her tongue, and leaped out the open window to the street in a few bounds.
"I'm the liar?! Just you wait!" Makoto laughed, chasing the incredibly fast girl.
Meanwhile, Kenshin was fulfilling his marital duty with all his might, gripping Hitomi's hips and slamming his big cock into her eager pussy. He'd long noticed his wives' extraordinary lust during pregnancy and was shamelessly exploiting her weakness now.
But for Hitomi, it wasn't as easy as it seemed. She strained to control the massive chakra volume in the tenketsu around her genitals and especially her womb. The task was far harder than expected, as Kenshin shamelessly used forbidden techniques, attacking her aroused, neglected nipples with his mouth.
"Uuuumpf!" the busty mommy whimpered as Kenshin thrust his cock full depth again, slamming into her cervix.
Milk spurted involuntarily from Hitomi's swollen nipples, instantly licked up by Kenshin's tender lips, who redoubled efforts to suck more sweet milk from her breasts.
Under such assault from her loving man, Hitomi couldn't dream of holding back divine orgasm, and just ten minutes in, she erupted like a volcano.
"UUUUUNGHH!" she screamed, locking her legs behind his back, refusing to release that divine cock from her pussy.
She completely lost control, forgetting the "experiment's" goal. Kenshin stayed conscious, focusing through pleasure moans on her chakra surge and the subsequent warmth entering his body.
"It worked!" he exclaimed joyfully, leaning for a kiss.
"Ummpf!" she exclaimed no less joyfully, climaxing again from the intense cock pulsations in her sensitive pussy.
Kenshin felt warmth spreading through his body again and was overjoyed. Though Hitomi's emitted chakra was far less concentrated, barely 20% as effective as Keiko's, it was still absolute success.
For the next hour, Kenshin only stroked, squeezed, and kissed his wife's incredible body, leaving Hitomi in indescribable ecstasy. Sparks danced endlessly in her white eyes, her pussy clenched wildly, milking all his cum, and ultimately succeeded.
"You're just incredible..." Kenshin panted heavily, collapsing onto the bed and placing a hand on her visibly swollen belly.
Hitomi purred affectionately, laying her head on his chest, going mad from his scent. She felt amazing, savoring the pleasant ache in her lower belly. Her chakra was over half depleted, but most dissipated unused by Kenshin's body.
An hour later, the lovers rose, and Kenshin helped Hitomi shower, caressing her body once more. She loved his touch so much; alone with him, she became a young, slutty girl wanting only one thing—and she got it, leaving the shower stall on wobbly legs.