What should I wear?(+1 Submissive)

I wasn't sure what else should I wear. But for sure it would be nice to get some tan. However, taking advice from my younger brother seemed weird. Then again, he was a guy and I was a girl, his perspective was reasonable.

• "Umm, I don't know what else to wear." I replied.
• "Let me help you with that Lucy. I am your brother, I just want to help you. You trust me don't you?"
• "Well, yes."
• "See, it's not that hard. Let's start with your top. You need to get some tan on that arms. Do you have something on straps?"
• "Yes, I have this one tank top with a cat on it."
• "Perfect, the same goes with your legs. It's summer sis. Put some shorts on, and let those legs breathe."
• "I guess you are right."
• "Sure I am. Now, go get changed, you will see it's better."

It all felt right, however, as I was leaving to get changed, he threw in one more line that got me worried.

• "Good girl, learn how to dress properly."

What did he mean? Was I his girl all of a sudden? He was my little brother, for sure it was just a harmless comment. I stripped down to my underwear and put on short shorts and a lovely white t-shirt with a sign drawing on it. I went back to the kitchen to show him my new look.

• "Well sis, isn't that better?"
• "It is, thanks for the advice. I think I should be going now."
• "Have a nice day Lucy, and remember to be a good girl."

I left the house for the bus. "What did he mean with being a "good girl"? I am always good." I wondered and jumped on a bus.