Thanks Yoshi, I didn't read in anywhere about the minimum/maximum pairs to have a nice experience.
ChromxSumia
MaMUxCordelia
OliviaxGaius
PannexGregor
I will try to make a nogrind (I like the idea~).
Those pairs are good? Are they good for the children? (I saw Alastor's explanation about Apotheosis, I think I won't do that for now, but I value the information from him).
Again, thank you guys~!