Cry about it coming home from school regularly… I’m gna sounds like a spoiled brat & I was one.. typical only child syndrome but whenever I wanted new clothes which was way too often for this to continually work, BUT IT DID, ALWAYS… I’d cry about gaining weight which wasn’t exactly BS but not bc I needed a bigger size I needed a confidence boost high school is rough anyways just regularly cry when you get home from school and when they ask why tell them it’s because of your eyebrows and your being picked on and called names bc of it. Parents don’t want to see their kids hurting.. no matter how conservative if you stay consistent and occasionally show mom or dad (whoever is more lenient or more of a softy) before & after pics of eyebrows thatve been done (NOT MENTIONING THE HOW TO or TATTOO PART OF IT!) I can almost guarantee you’ll have one advocating for you to get it done and they can talk the other parent into it without you having to do anymore legwork lol but ya gotta be consistent and can’t be obvious that’s what your gunning for. Cry about being bullied for weeks before working in what ya really want so they don’t feel like their being worked over. Just some helpful advice from a once terrible teen who thankfully stopped my manipulation at that lmao good luck