That was really silly thing to say, "sugar mommy" at age 12, that's insane, little girl paying a grown up man to be wi~~ oh, right...
Then the reality struck, terrible timing as things were so pleasant...
Rinko parents divorced and mother is blaming her to be alive, what kind of parents do something like that, oh. Haha.
Sumire wouldn't and cannot understand what Rinko is going through, she had so much strength to hold everything back, although saying way too much to cause suspicions, at least held back enough to not go overboard and sent her away.
Fuck that mom with a rusty morningstar, didn't deserve Rinko.
Thanks for scanlation!