Can you elaborate on what do you mean by soft wholesome NTR? The husband being happy with sharing her and stuff, but it escalates into things he don't want?I can't spoil how the plot will progress.
#spoiler -but it will start from soft wholesome NTR to hard....
Or you mean like slow burn NTR where it starts with the girl being a loving wife/gf and slowly gets corrupted behind the scenes?