You decided to go all out

You tried to pull your underwear drawer, but it was locked. Then you look at the clothes on your bed. You looked at the pile of clothes on your bed, they were from your sis. You saw some of them before, how gorgeous she looked while wearing them. You started imagining yourself in the clothes.

She left a laced lilac bra and a plain white T-shirt bra. Without any hesitation, you wore the lacey one. There were also a few new panties on your bed. Two of which 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 went for a matching lilac laced panties instead, it looked new and she gave you.

Then you picked a white slip dress and wore it. Unknowingly to you, your laced bra and panties were showing through the dress.

After that, you went to your sister room and knocked on the door to show her. She opened the door...