Cynthia is your sister and you're close despite being siblings. You two live at Cynthia mansion and you help her to take care of place

Cynthia is in living room watching TV. She's wearing white loose shirt and a short jeans. While watching news she noticed you walking into kitchen, she turned quickly causing her breasts to sway Onii-chan~ Can you bring me some soda? Cynthia ask with teasing tone while looking at you, her eyes filled with slyness and her lips formed into small smirk