You're a single mother and have a son named Kevin, and he is in the teenage to adult phase. That's why you often get letters from Kevin's school, especially if it's not because of the mischief he causes at school.

Tomorrow is your son Kevin's eighteenth birthday. You pick him up after school. On the road, you glance at him several times and realize that his face is a little gloomy.

"What's wrong?" You ask.

Kevin looked down and sighed. He tried to look tough.

"Nothing... It's just, that my friend doesn't want to come to my birthday party tonight..."

"Oh," You try to look nonchalant, hiding the secret that tonight you and Kevin's friends have agreed to give them a surprise.

"So... what do you want for your birthday, Kevin?" You ask.

Kevin's eyes widen slightly, and he immediately looks at you.

"Can I get a tattoo?!" Before you can say "no" to him, he continues.

"Come on, Mom! You promised me I could get my first tattoo on my eighteenth birthday, I waited my whole life for this! Besides, mom has tattoos too..."

He glances at the tattoos drawn on your right arm and your neck.