The epilogue wraps the story, both wife and husband delop MC's fetish into netorase, he knows she's a horny slut and tells her to be honest about it, he lets her fuck randos but won't allow them go raw, they plan to have a child at last at the end.
Yep, the ending of the serial version had that twist where it was revealed Yuu wanted to taint Rio all along, he loved how perfect she is but Yuu wanted to test Rio with just how dirty she could become while still loving him, Yuu set up sereval trappings for Rio to lay with other men but they all failed to sway her... that is, until Yuu found about a professional NTR Agency that surely would fulfill his desires to make Rio fall; a dangerous game Yuu took a twisted pleasure in because he believed Rio would surely still love him the most at the end of the day, thus Rio was a "Good Wife" (title drop).
The Soushuuhen epilogue shows Yuu and Rio rekindled with absolute strengthened love after the whole Sasaki episode where Rio finally got exposed but Yuu reassured her he loves her no matter how dirty she got (all according to plan!), the lovely couple has amazing sex, Rio is so happy she wants to stay like this forever with Yuu! However he gets that sinister glare, calling Rio a liar, she is still in heat, longing for more pleasure beyond what her husband can deliver, he can tell, no use claiming otherwise...
Thus Yuu and Rio go out at night, Yuu sincerely tells Rio to do whatever she wants, he is going home, Rio is a little worried but Yuu reassured her, saying he knows Rio only loves him, it's ok. Then two buddies are walking by, one is complaining about dating being a pain, he bagged a chick who wants an actual relationship, he doesn't want that shit so he ghosted her, man, he wonders if there's a chick who just wants to have a casual fuck... well, it is his lucky night, right there Rio is masturbating in public like a mad slut! The dudes feast on her right away, they can't believe this random woman is such an amazing pull.
Yuu didn't go home of course, and Rio knows it so she gives him an amazingly lewd look, Yuu says she never looked at him this way before, Rio gets even more daring with the two guys, wanting them both at once, they go all out yet Rio wants more but they ran out of condoms, the guys try to excuse themselves of bearing any responsibility for going raw... that's when Yuu jumps on them shoves the dude out, Yuu is on an animalistic frenzy, he is the one who will do Rio raw! He coldly tells the guys to get out of his sight, they try to complain but Yuu manages to scare them away.
Rio meekly asks if Yuu got jealous after all, but all Yuu does is get rough with Rio, angrily noting how Rio became great at riling men up, she is insanely sexy! This twisted couple have amazing sex outdoors, Rio is unarguably over the moon with Yuu, she came hard and he came inside her, in the afterglow Yuu simply suggests they make a baby, Rio is surprised then immediately happy, saying she will stop talking pills and condoms. THE END. --------------------------------------------------------------------------------------------------------------
Well there it is, Yuu ended up as a power cuck and Rio a "good wife" still, I'm still surprised the series ended this way, what a twist it was.