The giggle made Emily mad. The second one made her madder. The third madder still. She was apologizing to Scarlett and all she could do is giggle? Oh she was fuming now!<br/><br/>The laugh was the straw that broke the camel's back. The anger was getting more and more and then all of a sudden it reached a crescendo and just.... faded away into nothingness. She started to smile instead of trying to shoot daggers from her eyes at Scarlett. The girl was on her bed, waggling her arm in the air.<em>"F-Friends!"</em><br/><br/>Um yeah, friends with erect penises! Emily blushed again. She seemed to be making a habit out of it.<br/><br/>Scarlett sort of got her laughing under control and sat up. "<em>Sorry, but do you realize what just happened? That was so classic! And actually yeah, I jerk off almost every time I'm in the shower. I don't know I just get so horny and I can't stop myself. It's been getting worse and worse lately, and I have to keep running to the bathroom or staying up to relieve the stress."</em><br/><br/>That was what was happening to Emily too - except for the jerking off stuff most of the time. She was trying not to do that even though it was sometimes all she thought about.<br/><br/>Scarlett patted the bed. Emily hopped up before she even thought about doing so. She and her sister were just so close....<br/><br/><em>"Man, you were really getting into it! Look how hard that thing is,"</em><br/><br/>Emily punched her sister in the arm. "Hey. You shouldn't be looking at my thing at all missus." She was smiling though. She looked down at her tenting shorts. There was a small wet patch at the peak of the tent. She reached down and pulled the shorts down to reveal the erect cock once more.<br/><br/>"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." She looked at Scarlett's tenting skirt. On a whim she reached over and pulled it up to expose her sister's cock.<br/><br/>"Just so you know, your tits are bigger than mine but my cock is ginormous compared to yours." She burst out laughing and nodded crazily at her sister as if to say that nodding made it true. In fact they both looked pretty similar in size and girth. Only the colouring differed.<br/><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?" As soon as the words were out of her mouth, Emily was blushing so much she thought she might set fire to the duvet cover. It didn't make her want to do it any the less though. In fact, if the spurting dollop of pre-cum that burped from her cock-head was anything to go by, it really wanted Scarlett to jerk it off.<br/><br/>"So what do you say..... Friends?" God, Emily was being<strong>such</strong>a slut!