Curious Sis Learns the Birds and Bees

Hey bro, I have a question for you. I heard your girlfriend yelling last night, what was going on? We had a talk at school about how some people are mean and hurt their girlfriends, were you doing that? Because I'll totally tell Mom and Dad if you were. Wait... You were WHAT? You put what where? Ewwwww. Well then why was she yelling? Because it feels good? Really? I dunno if I believe you. I can try it? Well. I guess it must have felt pretty good if she was yelling that loudly...