Scarlet rubbed her arm and grinned.<em>"Hey. You shouldn't be looking at my thing at all missus." </em>Her sister was such a goof. She couldn't help glancing down with her, and unconsciously bit her lower lip when she saw that gorgeous wet spot. But she definitely wasn't expecting her to pull her shorts down! Her eyes got a little bigger, but then her grin just got bigger.<br/><br/><em>"It is really hard isn't it? I doubt it is going to go down on its own. It used to. Up until a few months ago I'd get a stiffy and just not think about it and it would go down on its own. Now though, now I can think about pretty much anything I like and it still stays rock hard." </em><br/><br/>"Hey!" she squeaked, but it turned into a gasp as her sensitive cock met the free air when Emily pulled her skirt up. She knew she should have covered herself up, but she didn't want to. She unconsciously bit her lip again.<br/><br/><em>"Just so you know, your tits are bigger than mine but my cock is ginormous compared to yours."</em><br/><br/>Scarlet put her hands on her hips and gave a look of mock sternness. "Yeah right. That little thing? I think I've got you beat on both counts." Then she collapsed into a giggling ball right beside Emily, her heart hammering in her ribs from delight and arousal. She wasn't really thinking at this point, just acting, moving on pure, automatic instinct.<br/><br/><em><br/>"I heard one of the guys in school say that if you jerk off with the 'other hand' its like someone else is doing it for you. How about if, um, we were each other's other person?"</em><br/><br/>Scarlet saw Emily blush deep red, and her own cock gave a sudden twitch at the thought. This wasn't like Emily but...she wasn't exactly acting like herself either.<br/><br/>"Friends," she whispered and laid her hand on Emily's cock tip. It felt warm on her palm, and she felt a tingle race up her arm. Slowly, her hand lowered and her fingers wrapped around the shaft. Oh god, it felt so warm and alive! She could feel the viens pulsing. It felt a lot like hers, but it didn't feel anything like grabbing her own.<br/><br/>"Ooh, I think you liked that," she half giggled half gasped. Then she began to stroke up and down her sister's meat, squeezing her hand tightly whenever she got to the top. She could hardly believe what was happening, but she didn't think about it too much. All she knew was she was stroking her sister off because she needed it, and there was nothing wrong with that!