Wear something that wasn't so feminine as so you thought

You tried to pull your underwear drawer, but it was locked. Then you look at the clothes on your bed. You thought you probably could wear panties underneath some boy clothes. You went to your cabinet containing your clothes and tried to open it, it was locked as well.

You looked at the pile of clothes on your bed, they were from your sis. You decided to pick those that aren't as feminine as they looked. Of course, you skipped the bra, there's no way you could be wearing that, at least not yet.

She placed two panties on your bed, new ones, they looked like what you bought for her. The red boyshorts and the green-laced bikini panties which you "wanted" to pass them to Cathy. Apparently, she found them in your underwear drawer and she's expecting you to wear them.

You decided to go with the red boyshorts, a plain T-shirt and a pair of black colored shorts. You go to your sister's room and knocked on her door.

She opened the door...