"I'm sorry if I pressured you before," I say. "I didn't want to---". She interrupts, "you didn't pressure me. I chose it." And, after a pause, "I liked it and I want to do more." Oh. She's processed the situation very quickly. "Can I help you cum this time?" she asks, in the sweet voice that I can never resist, which she uses when she needs to borrow something or ask for a favor. I'm a little bit hard already as she looks me in the eyes and kisses me on the lips.
She pulls my jeans and black boxers down. I still glance around nervously even though I know we're the only two people in the house. "Have you ever done this before?" I ask her. "Yeah, a couple of times with my ex-boyfriend," she says. She gets on her knees and starts rubbing my cock up and down. My slutty stepsister is about to give me a blowjob. I hope desperately that I won't cum immediately, but I did already masturbate twice today.
She puts her mouth around the tip of my cock and builds her way gradually up to the point where she has the whole thing in her mouth. I would not have guessed she was a deepthroater. "You don't have to do that if you don't like it," I tell her. As she makes some noises to signal it's okay, she sends vibrations up my cock and through my body. With one hand on my ball sack and the other steadying the base of my cock as she jerks it off up and down with her mouth, Gina is doing everything I've dreamed about and more. With every other girl I've been with, it take a couple of tries to learn what the other person likes, but my stepsister is doing everything right first time. I ask if I can cum in her mouth when I get there, and she hums again in agreement. It's not a huge load because I've masturbated twice that day, but a wave of cum shoots out and hits the back of Gina's throat. She takes her mouth off my cock, opens to show me what my cum looks like inside my stepsister's mouth, and swallows. I thank her and get the midnight snack I came here for.