Andrew thought about going to sleep, but with a new playstation and no school tomorrow, the night was young! He quickly put his pajamas on, putting the top on over the bra. It really felt nice, his nipples had been a bit sensitive lately, which a quick search on google the week before told him wasn't rare for boys his age. The bra seemed to help though, which he figured was one of the reasons girls wore them. Besides, he was alone in his room, so who would see? He turned on the console and began to play, losing track of time as he started a JRPG.
Sometime later, Andrew's party was now level 10, and he heard a knock on his door. "Bro, are you still up?" Alice's voice asked.
"Yeah, I'm playing with my present," Andrew replied. "The graphics are incredible, wanna see?"
Alice opened the door and saw her brother sitting on the floor with a controller in hand, moving a character around on the screen. She also noticed the outline of the bra she had given him through his pajama top. "So, you had a nice birthday?"
"Yup, it was great."
"Sooo... I was wondering, what did you think of my present?"
Andrew blushed a bit. "It was... a surprise. But I guess I deserved it after I did it to you in front of all your friends. At least it was just Mom and Dad. But..." He paused the game. "Can you keep a secret from them?"
"A secret? That depends on how juicy it is." Alice replied.
"That bra actually helps... I didn't want to tell anyone, but my chest has been really sensitive lately. I looked it up and it's a thing that can happen in boys and it'll go away so I shouldn't worry about it but the bra makes it easier to deal with."
"Well, I guess my joke gift turned out to be useful," Alice said. "Actually... I have some others that don't fit me any more. They're just taking up space in my drawer. "You can have them if you want."
"Sure, I'll take them. Thanks, sis."
" 'Kay, I'll be right back." Alice rushed over to her room and gathered up her old bras, then rushed back. "Here you are." She dumped the armful of bras on Andrew's bed. "If there are any you don't want, feel free to just toss em. I'm going to head to sleep, so good night, bro." She turned to leave, but then realized something and fished through the pile of bras. "Just and FYI, you really don't want to wear the one you have on to bed. Try this one instead, it's soft and doesn't have any tight elastic." She held up a powder blue bra and then put it separately from the others.
"You knew?" Andrew asked with a blush.
"Well, even if I didn't see the outline through your shirt, it was pretty obvious based on what you told me. Don't worry, I wont' tell Mom and dad yet. If your breasts start to actually grow you'll need to see a doctor though."
"Right, thanks, sis."
"Sure thing, bro. Good night again."
"Good night, sis."