Calm her down.

You decide it's time to use the magic word.

Chanting it in your head, you respond in a surprised voice, "What? Have you forgotten how every time you finish taking your shower, I come here and watch as you continue on with your normal routine? Why're you reacting so strongly, sis?"

She opens her mouth to protest, then closes it again. She looks confused for a second. Then she smiles sheepishly, exclaiming, "Whoops! How had I forgotten about that? I guess I need more RAM in my brain, 'cause my memory's been pretty bad lately. Guess I'll carry on, then!"

That taken care of, she walks over to her desk, turning her side to you as she continues on humming happily. She shrugs off her towel and drapes it across her chair in one swift move, exposing her naked body in all its glory. You take in the sight of her full, pert breasts and her round bubble butt. Your dick involuntarily jerks at the sight of the beauty in front of you as you let out a tiny groan. She doesn't seem to notice, and instead reaches for her bra, but accidentally drops it as she moves to put it on. It falls onto the table, then slides onto the ground below. Turning her back to you, she bends down to retrieve it, and finally you're able to see the areas your cock lusts for: her cute, puckered asshole and her clean shaven pussy. It takes all of your resolve not to yank off your pants and fuck her right now. She straightens up, clasps on her bra, then proceeds to put on the rest of her attire, giving you a magnificent view the whole time.

When she's done, she turns to you, stopping her humming for a moment, and says with a playful smile, "How do I look?" "Beautiful," you respond. "Like an angel." "Awww, that's so sweet of you," she says, averting her eyes, blushing a light red that makes her seem even cuter than before.