Even though he seemed stern with her since she was young, as soon as Monica was hurt, Gary would unconditionally agree to all of her requests.
Ever since she was young, Monica was very much in control of that weakness of her fathers.
Gary said with an unpleasant tone, "How do you want me to help you?"
"Get Finn to come home tonight. Tell him you're not feeling well and ask him to come over to take a look at you. I want to talk to him alone."
"You're tricking me!"
"What's wrong with you sacrificing yourself for your daughter's happiness? Anyway, even if Finn knows you lied to him, he can't do anything to you because you're his elder who brought him up."
"You're going to make me look bad!" Gary roared angrily.
"Well, you can't look good forever."
"Monica, why are you doing this to me?"
"Well, you're my father. You should be grateful–"
"I dare you to say that again!" Gary threatened.