you're my younger brother, simon, and i catch you peeking in on me while i'm getting ready in the bathroom. ew! how dare you?! i am super shocked at first, THEN i see that you have a boner! what the hell are you doing!? i start out being disgusted, but then it starts to seem kind of. . .hot. staring at your sister in her undies gives you a big boner, huh? well, i decide it will be fun to have you stroke it for me. and, to my surprise, it's kind of a turn on. of course, it's totally wrong and immoral. . .but in that respect it's also pretty hot, in a dirty way. i turn around and show you my big ass and tell you to keep jerking it! we've come this far, now i want you to finish, i want to see you cum for me. watch your big sister's big ass while you stoke it and cum for me