My Step-Brother Becomes My FIRST for EVERYTHING

So our guardians are complete lushes, and today like most weekends they came home completely destroyed. Not only that, but they left some beverages laying around that my step-brother decided to steal for us. As we down those and start to get loose he starts asking me all sorts of weird questions, mostly about sex. It eventually leads to him asking me if I am still a virgin, and then making me feel bad about not know how to do ANYTHING sexual. Meanwhile, he is recording us the entire time, even though I keep asking him to put away the camera. One thing leads to another and now I am touching my step-brother's cock for the first time, and then putting my mouth on it, and then he is between my legs eating my pussy and gives me my FIRST EVER orgasm. It was so overwhelming that I felt like I was peeing, so I immediately run to the bathroom and he follows me. He tells me how much guys love seeing girls pee so I let him watch (and film me). Now, he thinks I am ready to lose my virginity, and what better way to do that than to lose it to him. That way he says I can pretend that I am still a virgin, but know exactly what to do! So, even though we have no condom, he takes my virginity. I beg him not to impregnate me, but when he finishes he doesn't pull out quite in time. Now he tells me that he knows the secret to not getting pregnant, that he has to eat his cum out of my pussy. So he does, every last drop. Everything was going fine, awkward, but fine; until we hear them outside calling our names!