For every “♡” I get I’ll give a tip on how to win my muse’s heart.
Offer to rub her feet when she seems tired. Farris feels most comfortable when walking barefoot - something she picked up from the Dalish and it just kind of stuck with her. She worked out some spells to keep them from freezing or getting hurt too much, but they are still sore at the end of the day. She might or might not let you touch them, but she will appreciate the offer nonetheless.
She very much likes to read. Offer to give her something interesting to read, give her a name of a good writer, talk with her about something she read about.
Tell her stories. She rather enjoys Varric’s tales, but will listen even more intently if you choose to tell her something about your life, be it the story of how you ate your first potatoes or how you slaughtered a village out of spite, as long as she believes they’re honest, you have her full attention.
Farris likes shiny things. Give her shiny things.
She also likes powerful things. Give her powerful things.
The mage picked up pranking people from Sera. When she does pull a prank on you she will always blame Sera, even if you catch her red-handed. You too should blame Sera. Even if you happen to be Sera.
Farris likes to watch people, taking notice of how they move, how they dress, what they say. She especially likes watching people shirtless. Engage in some physical activities without your shirtwith a your favorite training dummy - she will contemplate the way your muscles flex under your skin for hours.
Never question where she gets money from. Just accept that she always has them. If you accidentally ask and receive a reply, accept that reply as truth.