You need a little more stimulation, so she takes off her top and shows you her perky young tits. You're really turned on now and feel like you could blow any second, but sis won't let you. She's such a tease! She takes off the rest of her clothing and puts her sexy feet on your dick. You didn't even know that was a thing! Sis loves teasing you with her feet and is excited by how turned on you are by them. She tries to make you cum with her feet, but really wants to feel you in her hand. Grabbing your dick, she squeezes hard and pumps you until you shower her with a huge blast of sticky white cum. What a great sister! First day of class seems a lot less stressful now.