When you've gotta go, you've gotta go! Young Emma here told us that she had to pee, so we snuck after her and snapped some pics and vid. Emma's the kind of girl who will do anything once, and that includes porn. "I'm super-nervous but excited at the same time," she told us. "I've only been with my high school boyfriend and one other guy. Both of them were skinny white guys, so I'm excited to fuck a stud!" When Carlos our professional cocksman dropped his pants and whipped out his cock, Emma's jaw dropped. We could tell she was impressed, so we asked her about her experience with cock sizes. "Carlos' is the biggest by far. I don't want to be mean, but my ex-boyfriend's dick is...I'm not actually sure. I'm terrible at judging the size of things. I think it's, like, the length of my iPhone 5. Yeah, that's it." For the record, guys, an iPhone 5 is just shy of five inches. That means that Carlos' man-meat was going into practically virgin territory. Still, Emma handled sucking that big…