I'm not sure if you know this about your step-father, but he really wants to have another step-son. The older he gets, the more he wants to preserve his legacy. We've tried getting pregnant but it's not going well. You know what happens when men get older... they have trouble in the... erection department. I know you want your step-father to be happy, don't you? This is really hard for me to ask, but will you help me get pregnant? Obviously your step-father doesn't know I'm talking to you. I know you find me attractive. Maybe you could take the love for your step-father & the sexual energy you feel for me & find it in your heart to do us this favor. If you just take your pants off, I'll do the rest. I know this is weird, but I have to give you a blowjob to get you hard. And it's okay if you enjoy it. I hear that if both parents are happy at conception, the resulting progeny will be happier. Just relax & let step-mother ride your cock. What if I turn around & ride you the other way? I bet you'll like that; your step-father sure does. As much as I love him, it's been a while since I've had a young cock. Do you think you can come inside me? Do it for your step-daddy.