This is a reference to how, if you remove Meluna from your favorites in Trickcal, she says, "Can we still be friends if I pay the friend fee?"

IndustriousMechanic said in comment #2623477:

This is a reference to how, if you remove Meluna from your favorites in Trickcal, she says, "Can we still be friends if I pay the friend fee?"

Some of those lines can sting. It’s quite sad to me that Meluna wants to try and buy the masters friendship.