Your Girlfriend and Your Roommate

Sarah hurries into your room and slams the door behind her. She’s breathing heavily and looks like she just saw a ghost. But underneath her look of shock, there’s a hint of arousal. You notice her hard nipples poking through her thin low-cut tank top and a faint smell of her sex lingering in the air. Do you ask her what’s the matter, or ignore it and take advantage of her arousal?