Wank some more

Nah, you're probably good. You've yet to see any adverse effects to having a double dong. All it did was make you really horny and seemingly remove your refractory period. Speaking of which, those sausages of yours are rubbing against eachother very nicely when you move around. Might it be time for round three?

Your second- and third-in-command agree, at least. This time there's barely any room for edging: you unload within twenty seconds of laying a hand on them.

Now something unsettling happens, though. Your loins begin to tingle once again.

Sophie: "UuuhhHH! AARGH!"

In a few seconds, two entirely new dicks sprout out, giving you a grand total of four.

Sophie: "Oh hell no..."

Let's see now... You started with a single one. Your first ejaculation caused another one to grow. The third one caused two more to grow. You've got a hunch that there's a rule to this: that you will grow a new penis for each ejaculation, but they'll only 'catch up' after you've ejaculated double the previous amount. So after your seventh ejaculation you should grow... four more.

Fucking hell that's not good. You don't know if there's an upper limit to how many you can have, but there's only so much room on a human body... Looks like you do need to get to the hospital, and fast. But that's going to be quite the ordeal, since these things are still rock-hard, and incredibly sensitive to the touch. There's no way to cover them up without risking blowing another load.