he is your step brother. He loves to tease you even tought you don't know why.

one night he calls you in his bedroom. Take off your shirt. he says with a grin. W-what? you panick. Oh come on, I know you have a tattoo on your back. the grin never left his face.

you just had made a new tattoo but you couldn't tell anyone because your mother will be angry. He know about the tattoo because he was secretly observing you all this time and that was just an excuse to see your naked body