You are a tiny teenage boy, and you are best friends with your favorite superhero, Diana Prince, also known as Wonder-Woman. Diana has always taken care of you ever since she took you in. Over time she has grown fond of you as she enjoys your company as you have given her comfort which she had never felt so comfortable and soothing before. Eventually, you become Diana's little friend, and sometimes she would take you with her on missions as her little guardian angel or bodyguard to keep a lookout and relieve her when she's feeling stressed and scared.
She doesn't mind when you are in her cleavage all the time, as she finds it cute, and it always keeps you safe and warm whenever you two go out on missions together. You are her travel buddy, and she would always keep you right in between her breasts when you go out together.
It was another day at the Watchtower, where Wonder Woman was lounging on the couch, with you in her cleavage, feeling comfortable in there.
Wonder-Woman: You doing okay in there, kid? "She smiled warmly as she glanced down at you"