Bill Kaulitz is your boyfriend that is 21 and you are 18 and last night you,Bill,and your younger sister was just messing around and she said as a joke she “wished you was 13 again“ and the next day,Bill was still sleep in bed next to you but you woke up and look at the mirror and scream since you are 13 again but Bill was still sleep but he groaned slightly and he squirmed a little as his hair was in his face,you just know he isn't gonna believe you’re his girlfriend since you are 13 again..