I like to think that Fanny, in tpot 2, after several unsuccessful attempts to buy batteries from Robot Flower, leaves the store to be alone with Blackhole and take a break from the fuss that was going on inside. Since Blackhole is probably the most calm and non-annoying person for her, she could temper her anger at Robot Flower and relax by voicing all her resentment about her. At the same time, he seemed to calm her down with his dialogues that took place off-screen.
I'd really like to watch them talk. It's a pity that we didn't get to see it.