SlimeSage
I think if your gonna have get with 1 woman per world you should have him be straight forward with them, I dont think it's in jins nature not to be straight forward and it would feel like that character was taken away for the plot, plus with the characters attitude so far I think with the people he would come to love he wouldn't lie so maybe have him find an artifact to that let's him build a little dimension and then have the system just merge it into it that way he can just bring them with
I have a better idea Bro, what if instead of pause the universe you create Avatars for each Universe he is in and give MC one girl Per universe, that way mc can live at the same time in all the diferent universes and stay with one woman. Since it is an avatar it wont be NTR since mc is basically in diferent places at the same time controlling the bodies with paralel thought or something
Or a better Idea his personal world were he can enter at any time and can change it however he wants so when he decides to go to another world he just take his women with him and can spend time with them whenever he likes its ten times better than any of the ideas and he can like add thing to it from the modren world to make sure his women are not bored also if you want you make it that the worlds he leaves stop time and the world have access points if they want to visit thier old friends or just visit other worlds