Touching brother's virgin cock for the first time

Your step-sister just found out you're a virgin, and you're about to go to college! You're a little embarassed, but sis has an idea. She wants to help you out. She can't have all of the girls in your school finding out and making fun of you, so she offers to teach you a little bit. Don't worry, Mom and Dad won't find out. She wants to help you learn not to cum so fast so you can set a good example for the family. She asks you to lay back and let Sissie take over. She takes your big cock out of your pants, and is surprised at how big your cock is. She never imagined her little brother has such a big dick! She wants to make sure you last a long time, so she spits on your dick and runs her hand up and down the shaft as your cock swells. 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.