"Yeah, lets go to the bathroom and figure this out." You're excited to try out what will be an "interesting" experience. Your twin seems nervous about it, but he's willing to try this out. You nod to each other before turning to the door and heading over to the bathroom.
On the way to the bathroom, your twin rubs his fingers along the left side of your shared penis. He asks, "Can you feel me rub the left side?" You respond, "Yeah, but like the right side for you, it's fainter. Looks like we'll have to focus on the tip of our cock for the most pleasure." You smirk and wink at your twin as you say this. He gives you a devious grin back.
To your surprise, your twin had already started to go to work on your shared dick, even before you and him reach the bathroom. He gripped it with his hand, and began to stroke it, which was very pleasurable for both of you. You used your hand to grip your shared testicles, and begin to fondle them in your hand.
You two did this while still walking, causing you both to stumble around a bit as you both focused on masturbating. In a way, this was like mutual masturbation, except you both masturbate with a mutual cock.
Right before you both reach the bathroom, you lose balance, and fall over. Despite this, you both work yourselves into a sitting position, and went back to masturbating together. This time however, you grab the penis before your twin can, and you go to work on it. Your twin follows suit and begins to fondle your shared balls.
Amazingly, you both are able to stand back up while still occupied with pleasuring each other. You both reach the bathroom, and turn to the mirror. You see yourselves masturbating together in surprising harmony. You turn your heads to each other with lust in your eyes, and you launch your lips towards each other and meet for a huge kiss. You keep your lips locked together as you both continue to work each other.
This goes on for about 30 seconds before your twin breaks the kiss. He looks at you and says, "This is wonderful. But since we share it, we should get to take turns with it. It's my turn again to work our cock." He releases his stranglehold over your shared balls, and grips the cock in his hand, both of you now holding it.
You shake your head at him and say, "We've each gotten one turn bro. We're about to cum anyways, just let me finish us off." Tension builds between you and your twin as you both try stroking your shared cock at the same time, causing rhythm to be way off. You both glare at each other with angry looks. Eventually...