It was only the third day since it happened, and he still wasn't used to it.  He wasn't sure he'd -ever- be used to it, but he had to admit it was fun.  Though when he got -stuck-...  A bit less so.  Like now.  He had no idea how to get back to just one mouth, and it was extremely awkward trying to talk with the strange setup he had now -- a doubled muzzle, with two mouths stacked on top of each other.   He couldn't even control them well yet; he kept biting one tongue while trying to use the other to talk.  Well, he decided, it was better than the time he'd ended up with two heads.  That was a pain in -both- necks.  He sighed, unlocking his door and stepping in.  Home at last, his one place where he can be himself.  
He stripped immediately, leaving nothing on his body, as he was accustomed.  He sat down and flipped through the channels on the tv, trying to ignore his erection as he looked for something to watch.  It was odd; he'd have expected such a change to him to have a far greater impact on his lifestyle, and yet somehow he was able to just ignore it most of the time, even if he had two mouths or three eyes or four arms... it was as if whatever form he was in was his natural form.
He soon got tired of watching miscellaneous documentaries that seemed to be all that were on, and found himself wanting to actually try his new ability on purpose.  He'd been avoiding it for a while, only using it to try to return to normal when an accident made him multiply.  Yet now some perversion of his mind was telling him to actually -try- to multiply, and in his boredom he found himself agreeing with it.  He tugged curiously on his cock--for what better to multiply?--and gasped as his hand pulled away, still grasping it as it slid up his groin; but now there was another one where this one used to be.  This felt -good-!  Two can't be enough, he thought, pulling out another, then another.  He did the same to his balls, yanking hard downward on them, which, admittedly, hurt for a moment, before the duplication kicked in and stretched his sac out as it filled with more balls--as he felt around he found a total of ten!  He couldn't think for all the sensations he was getting from all this, but he was able to realize that two hands just wouldn't cut it, and pulled out another pair, then another!  Each cock got one hand stroking it, and the remaining pair practically kneaded at his mass of balls.  All these sensations from all these genitals overwhelmed his mind with pleasure as he came quite heavily, the orgasm so intense he actually ended up unconscious for a while afterward!
He woke up and blinked a few times, shaking his head.  That was -intense-!  Maybe this isn't so bad after all.  And that was only masturbation, what would it be like when he actually had sex?  He couldn't wait to find out, and he was actually disappointed that he was all spent.  It appeared he still had all these extras... how to get rid of them?  He tried willing them away--that had worked before, but apparently not this time.  He tried pushing them into each other, and sort of succeeded; they fused together, but now he just had one pair of enormous balls and a huge cock.  He tried compressing this huge cock, and finally managed to get it to a more normal size--though a bit bigger than before; he couldn't help it!  Now for the balls, he thought with a wince.  Mayyyyybe leave those for later.  I can deal with giant balls for a while.
He looked over the mess he'd made--far bigger than what he usually made!--and sighed, going to get something to clean up with.  It took a long time to get it all out of the carpet, not helped by the fact that he now seemed to leak pre completely randomly and all over whatever he was doing at the time.  But he got it cleaned up, and got a condom on to catch the leakage, and he sat down with a soda and turned the tv back on.