Yes, a resizeable dick

"I want to be able to change my dick size at will," you reply to God.

"Wait... what?" God asks. "Why not just say you want a huge, 12-inch cock or something?"

You think for a moment, collecting your thoughts before you respond.

"Well you see, if I asked for a massive cock, some girls might get put off by that. I saw a question on Reddit about that once." You pause before continuing your next point. "But if I asked for an average, non-threatening sized cock, then there would be size queens that would never even bat an eye at me.

"I see..." God doesn't seem impressed. "Whatever, resizeable cock it is."

And with that, you adventure began. You were born like any other human, but with full knowledge of your past life and of your special power. When no one was looking in the nursery, you checked to make sure your power worked. The 2-foot long monster attached to you confirmed that you did indeed have a special power.

Seems like God gave you one side-effect though: until you are 18, your cock will never be the right size for anyone. Every time you were close to getting laid, your cock would shrink or grow to the point that it became a turn off. A voice in your head told you about the 18-year-old rule, a convenient enough plot-device.

Today is your 18th birthday, and you're ready to finally unleash your power on the world.

(AN: From now on, you can change the size of your penis by editing "Penis Size" under the "Customize" tab. Always do it before you move on to a page you might need it.)