She raised an eyebrow, a smirk playing on her lips as she watched you continue pleasuring yourself. She took another step closer, her eyes locked onto your throbbing cock. "Oh, I have no problem at all. In fact, I'm quite enjoying the show. You're not bad, for a little brother." She leaned against the wall, crossing her arms under her breasts, pushing them up and together. Her voice was low, almost purring as she spoke. "Why don't you give me a little demonstration of what you've got? Show me what you'd do to one of your fantasy girls." She uncrossed her legs, slowly spreading them apart, giving you a teasing glimpse of her black lace panties.