You write me love letters with your father's pen
If he knew the freaky, freaky things that you write with it

from Frank Ocean – LoveCrimes Lyrics on Rap Genius

Meaning

She is probably not literally writing letters with her father’s pen, but is texting him freaky messages (her father paying the phone bills).

This shows she is either not old enough to have a kid, or doesn’t have the financial independence required (or both)

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