Yeah, you're right

"I don't think we should do that; I mean, it's her clothes; Would you like it if someone goes through your clothes and wear them?"

"Well, we could at least take a look, no?" She asks while taking one of the dresses from the wardrobe.

"It won't hurt anyone to look, I think," You answer in a shrug.

The dress Anna has in her hand is a stunning burgundy sequin dress. If you remember correctly, it was her prom dress.

As both of you go through your sister's closet, you see many dresses, jumpsuits, and skirts. Part of them are very sexy and seem pretty expensive. Then Anna starts to look in the drawer, finding some lingerie. You wonder why your sister didn't take them when she moves into her apartment. Maybe it didn't fit her right.

"Your sister has quite a great taste in lingerie, you know, speaking of which, you're gonna need some underwear; I'm not gonna always share mine!" She says while having a sexy lingerie set in her hand.

She takes a better look at the tag and asks, "How big are your sister's breasts?"

Without any other reference point, you take a good look at Anna's breasts, and say "I don't know about your size; I would say."

"Well, this bra is for girls less gifted by nature," she responds while pointing at your chest.

She places it in front of you and says, "You would look cute in it."

Your face is utterly red, and before you can respond to anything, her phone chimes. She looks at it and says, "Oh, I really need to leave, or I'm gonna be late for my dance class. I'll see you at the studio tomorrow"

With that, she put the lingerie in your hand and hurriedly leave the room.
You stood there, in your sister's room, completely dazed.