Aimee knows why your ex dumped you. You could get your dick up, but it would not stay up. You are embarrassed that Aimee knows this and, in fact, Aimee wonders out loud if you might be gay. Since you swear to her that you are not gay, she has a way to figure out if you have some other issue. You trust your big step-sister (really, she is your step sister), so you decide to do what she says. Get comfortable while she gives you a show. She removes her top and you see her tits. How do you feel about seeing her tits? Aimee has soft, perky boobs and that inspires your dick to grow a little. Take your dick out. That is better. Now start stroking it. Oh, your dick seems to be shrinking, so she exposes more of her body to you. Yes, that helps. Sliding her panties to the side to reveal her pussy really seems to help you! You see a piercing on her pink bits and your pick up your stroking pace a little more. You can see that her pussy is wet, but your erection is not all it should be.