I ship those two other girls thoguh. Simply because they appeared sitting next to each other at the end of the chapter. Is this a problem?
In Chuuni one of the characters makes a joke about having a like seven year old kid and I instinctivley added backstory for her to fit my yuri needs before she could even say it was a joke. 2 different backstories actually, in one she was gay, in one she was bi. She didn't even have any moments with anybody, I just did it.
So don't worry, there are way worse cases.