[Oh, drunk, that was a good idea, she should have just pretended to be tipsy and let one thing lead to another. Well, for now, she sticks at the door, careful not to scare her sister further.]

Well, I overheard Mother speaking about wanting to clean your room sometime soon...

I figured I should warn you in case you had any dirty magazines. [Or, you know, were panting and moaning on her bed, looking so delectable.]

And, actually, I started cleaning it a little yesterday, just to try and do you a favor so that you could focus on your paintings... and I found your private sketchbook. [She's found all her private sketchbooks, really, and it's been going on far longer than that. For now, though, this gives her the best angle of approach.]