He reacts about as well as you'd expect.

Tanukichi stared in shock out his apartment door as he tried desperately to comprehend what had just happened to him. His own mother, Ranko Okuma, known far and wide as the infamously dangerous Full Metal Ogress, had just given him a full lover’s kiss on the lips. His heart was a whirlpool of emotions, with fear mixing with confusion and disgust at the taboo he had just broken, but with a hint of arousal underneath it all. It was all so much that he had to brace himself against the doorframe just to stop himself from falling over.

“Well?” Ranko interjected, breaking Tanukichi out of his stupor. “Are you just going to keep staring at me, or are you going to invite your mother in like a good son?

“H-huh?” Tanukichi hastily stood up straight. “Y-yes. Please, mother, come inside.” Tanukichi stepped out of Ranko’s way and turned back to face the women at his dining table. “Everyone, I’d like you all to meet my… my mother.”

“Oh, so you’re the famous moral crusader that I’ve heard so much about.” Yua stood up and shook Ranko’s hand. “My name is Yua Okuma, one of your son’s teachers and newest wife. Over there is my daughter Tamaki, who I suppose is now technically your granddaughter. Allow me to take the opportunity to say that it is an honor to meet you; I have long admired your work in cleaning up the dirtiest parts of Japan.”

“The honor is all mine - it’s teachers like you instilling proper virtues into the next generation that are the true moral backbone of society.” Ranko shook Yua’s hand before moving onto the other older woman at the table. “And who might you be?”

“My name is Yuria Okuma, and I’m Tanukichi’s first wife,” the clerk replied, taking her turn to shake Ranko’s hand and kiss her on the lips. “It wasn’t an honor I planned on having, but I must say that it has been quite an enjoyable experience so far.”

“That’s good to hear; I’d be more than a little disappointed if my son turned out to be a bad husband,” Ranko said, causing Tanukichi to shiver in fear behind her. “And you must be… Anna, aren’t you? Matsukage’s daughter?”

“Ah, so you remember me! How lovely!” Anna smiled sweetly as she went in to kiss Ranko as well, causing her oversized breasts to press against the other woman’s relatively flat chest in the process. “It’s so nice to see you again. May I ask what brings you out to our neck of the woods?”

“Funny; I was just about to ask you the same thing,” Ranko replied, taking off her military jacket and sitting down at the table in the last unused chair as Yua gave her a fresh plate of pancakes. “Shouldn’t you be at home with your mother?”

“Me? Why, I was just helping take care of Tokioka’s favorite student, is all,” Anna said innocently, though her moist pussy hidden underneath her skirt told a different story. “He is helping make Tokioka an even more moral place, after all.”

“How sweet of you; I expected nothing less of Japan’s pinnacle of womanhood,” Ranko complimented, tipping her hat. “As for me, I came here to see my son as well. You see, I’ve spent the last few years hunting down all obscene material that I could, but for the last few months our computers haven’t labeled even a single sheet of paper for sterilization. So, I was considering whether or not to retire when I heard about what Tanukichi here was up to; so I decided that I can continue to do my part by joining forces with my son to eliminate indecency once and for all.”

“Wow… how inspiring! Truly, all those medals you’ve been given have been well-earned!” Yua said, clapping her hands together as her eyes sparkled with admiration.

“Thank you for the compliments, but I must admit that I’m not motivated entirely by selfless reasons,” Ranko replied. “To tell the truth, I’d gotten somewhat lonely working out in the field for so long, and I wanted to spend time with my son again. So, I hope you don’t mind having an extra wife around the house.”

“W-wait, another wife!?” Tanukichi stammered. “You don’t mean-”

“Yep; even if he’s an arrested criminal, I never actually got around to divorcing my old husband. Which means, given the rules that Taunukichi revealed to society, I am now his.” Ranko smiled and looked up at Tanukichi. “Now, I expect you to take good care of me, okay? Just because I’m a soldier doesn’t mean you can slack off.”

“...” Tanukichi just stood there, mouth agape, too shocked to think of any sort of reply. After all, what was there to say after a revelation like that?

“Oh my! Well, this is unexpected, but I assure you that we’ll all be delighted to have you here with us,” Anna said politely before dropping her knife onto the floor next to her. “Ooops, clumsy me! Let me go get that.”

Anna leaned down to pick up the knife and, in the process, brought up her foot from underneath the table to deliver a swift and powerful kick directly to Ranko’s face. Seeing this coming, Tanukichi flinched and moved to cover his eyes, but the blow never landed. Instead, Ranko blocked the kick easily with the back of her hand.

“You really must be more careful, dear Anna,” Ranko advised cooly. “It is rude to drop someone else’s dining ware, after all.”

“Yes, of course; how thoughtless of me!” Anna apologized, blinking in surprise as she sat back down in her seat. “I really don’t know what came over- ooops~”

This time, Anna ‘accidentally’ picked up her plate of pancakes and tossed it, hurling it like a frisbee directly toward Ranko’s windpipe. The older woman, however, didn’t even flinch as she caught the plate perfectly without so much as dropping a crumb off it.

“Again with the silly mistakes… and here I thought your mother taught you grace,” Ranko said, putting the plate down as everyone else at the table shivered in a mix of fear and confusion. “If something like that happens again, I may have to ask you to leave.”

“M-my apologies; I promise, it won’t happen again.” Anna bowed her head respectfully. “It’s just… this table is rather crammed, don’t you think? And getting a bigger table would be such a pain… perhaps it would be better for everyone if a few of Tanukichi’s wives went to live somewhere else, don’t you think?”

“Nonsense; a husband and wife living in different homes? Preposterous; that kind of thinking is the first step toward loss of love, and divorce,” Ranko countered. “If he needs more room, then he should just get a bigger place. After all, it is a man’s duty to take care of his spouse, and I don’t see how having multiple changes that. If anything, having more wives just multiplies that responsibility. Unless, of course, you think my son isn’t up to the task.”

“No, of course not!” Anna bowed her head instantly, apologizing twice as hard. “I would never think of insulting my dear Tanukichi, the most precious man in all Japan!”

“Don’t worry, I know you wouldn’t.” Ranko pat Anna gently on the head, eliciting a soft coo from the silver-haired girl. “Now, let’s all return to breakfast, shall we?

“Gah!?” Tanukichi nearly fell over from what felt like the fifth heart attack of that day. “A-a new place!? How am I supposed to afford that?” he thought silently.

“Oooh, a new home? That would be really nice,” said Tamaki. “There’s barely enough room for any of my stuff here, and I’d like to have my own bathroom again if I can.”

“I’ll, uh, see what I can do, sweetie,” Tanukichi replied, his left eyelid twitching.

“That’s the spirit! Now, let's return to our breakfast, shall we?” Ranko said. “It would be a shame if any of us didn’t have enough energy to complete our days. Especially you, Tanukichi! You’ll have a lot of women out there waiting for you to give them children, and I won’t have my son slacking off!”

“Y-yes ma’am!” Tanukichi gave a hasty salute and returned to eating his food double-time. “Augh, I can’t believe this is happening… of all the people I had to kiss today, why did it have to be her!?” he thought to himself as he chewed. “But on the other hand… she actually managed to get Anna to back off without even breaking a sweat. I guess I shouldn’t be too surprised since she’s fought hundreds of ‘pervert’ holdouts all over the world, but that was still more than I could ever do by myself. Maybe having her around as a wife won’t be so bad after all…”

Tanukichi paused for a moment before slapping himself in the face.

“What am I thinking!? I can’t be married to my own mother! That’s the most perverted thing imaginable!” he screamed inside his own head. “I’ll have to gouge my own eyes out to atone for such a grievous sin!”

His hands shook in panic for a few moments before he took a few breaths and regained his composure.

“No, no! There’s no need to panic; after all, I haven’t done anything dirty with her yet. I just gave her a kiss, and everyone knows it’s perfectly normal to kiss your mother!” he reasoned to himself. “Granted, the kisses aren’t usually so… intimate… but my point still stands! All I have to do is avoid having sex with her, and I should be fine!”

“So, if you don’t mind me asking, what else has Tanukichi been up to besides giving me some new daughters-in-law?” Ranko asked, striking up a casual conversation.

“He’s been quite active, to say the least,” Yuria replied. “He’s done so many favors for improving the morality of Japan… banning sinful underwear… improving the way we greet each other… giving us the gift of children again… and teaching us how to have more fun while he’s at it too!”

“Yes, it has been quite amazing,” Yua agreed with a nod. “And to think, it’s all because of your ero-ist husband for teaching him about lewdness all those years ago.” Yua moved to take another bite of her food but stopped herself when she realized how insensitive that comment was. “Er, sorry… I didn’t mean to bring him up so callously…”

“Don’t worry, it’s fine; I don’t mind talking about my husband-, sorry, ex-husband at all,” Ranko replied casually.

“Really?” Yua blinked a few ways in surprise. “Well, if you don’t mind me asking then… why did one of the most moral women in Japanese history ever choose to marry someone who was so… debauched? Did he trick you? Or use some kind of mind control?”

Tanukichi thought he heard his mother laugh for a moment, but it was hard to tell.

“No, he didn’t do anything at all like that,” Ranko explained. “I know this might sound a little strange, but the simple fact of the matter was he was a kind and charming man, and we still loved each other deeply even if we usually disagreed on politics.”

“Charming? Kind? That doesn’t sound like the man described in the news reports at all,” said Yuria.

“Well, the news doesn’t always tell the complete story,” Ranko replied. “Still, I agreed with the decision to lock him up in prison; a man who disrupts the peace like that doesn’t deserve to be free in public.”

“R-right, of course…” Tanukichi said as he nervously glanced down at the floor. “Exactly what he deserved… after all…” Tanukichi stood up and put his hand over his heart to repeat the mantra that his mother ingrained in him ever since he was a child. “It is our duty to Japan and our future to be pure and sinless!”

“Mmm, it warms my heart to hear that you’re both so loyal to the morality of Japan even with your sinful family connections~” Anna said with a smile. “And to think that there could be anyone out there who might doubt you.”

“Yeah… to think anyone would…” Tanukichi tried not to glare at Anna as he sat back down and finished his food. “Alright, I think I’ll go finish getting ready for school now… I’ll, uh, try not to take up too much time showering.”

“Would you like me to come with you?” Ranko offered as he stood up. “It would save on time and hot water if we both showered; plus, with the both of us naked it would be the perfect opportunity for you to give me a child.”

“Bwah!?” Tanukihci nearly tripped over his own feet as he spun around. “You want to have a child… with me!?”

“Of course; why wouldn’t I?” Ranko replied simply. “You’ve said before that there is nothing wrong with a husband and wife making babies together. Plus, I’ve seen the population statistics and I know how rapidly our nation’s population has been dropping; with a crisis like that going on, you wouldn’t really think of turning me down, would you?”

“N-no, of course not!” Tanukichi put up his hands defensively as his mother’s glare shot through him like bullets. “It’s just… making sure you were pregnant would take so much time, you know? A-and it’s a sin to be late to your first class at school…”

“Hmmph… I suppose you have a point.” Ranko sighed. “Fine; hurry up and finish getting ready, but I expect you to take responsibility once we get there.”

“R-right, of course…” Tanukichi said before rushing to the bathroom. “Jeez… maybe having Anna draining me dry isn’t that bad of a fate after all…”