You start small, with your left pinky, you tug on it as hard as you can, but all that happens is that it gets sore. Then you pull on it with the intent that it comes off... Pop! Your pinky is off, and you can still feel it and move it, like it was still attached to you. To your astonishment, you can still do the same things with it as your cock.
You play around with it, but eventually you put it back on, and on a whim, tell it to no longer be detachable. This time your finger locks on, and you can feel it snap into place. You flex it, and aside from a pop or two at first, it seems perfectly fine... and more importantly it won't come off you at all... not until you tug on it again with the intent that it detaches, only then does it detach once more.
You try this with your cock, same deal. As soon as you tell it to be non-detachable, it is firmly anchored to you, just like the day you were born. Of course, you decide you like it detachable, so you return it to being able to come off again.
"So, I can take parts of me off, and put them back on, I wonder what happens If I tell something to no longer detach, and stick it to something..." You ponder once more.
You have a mole that's been bugging you for awhile next to your dick, so you pick it off, then stick it to the wall and tell it to no longer detach. As soon as it sticks, you have zero feeling of the thing... and seem to know it's a part of the wall now. Huh... You pluck it off, and tell it to no longer be detachable again, and stick it back on. Once more it is a part of your body, and you feel it normally again.
"Hmm, so I give bits of myself to people or things... not that I'd want to, except for maybe moles and warts." You muse to yourself. "But I wonder, what about other people and things."
You start small again, you take a pencil and detach it through the middle. Instantly, you have two sticky pencil halves. Then you stick one to yourself, and try to give it to yourself... it works, and it's weird! You can feel the pencil, and you can write with it, very very well, and it seems to regenerate it's lead. Cool... but freaky! You reform the pencil, deciding you don't want it as a part of you. Thankfully as soon as you cement the writing half to the eraser half, you lose feeling of the thing.
"So, what about living things?" You ask yourself. You look at your gecko's terrarium for a moment, then shake your head, you are not messing with one of your pets! However, her food is another deal. You get dressed and go down stairs to grab a cricket from their cage in the basement, where you and your parents keep a colony of them to feed the handful of reptiles you own. After a bit of hassle trying to grab one, you snatch one in your fingers and close the box they live in without any getting out.
With the cricket in hand, you gently pull him in two, intent on detaching him. To your amazement, the cricket is in two pieces, both alive and very much apart of each other, yet in separate spots. You reassemble the insect and put him back... then give your hands a good long look... You can detach just about anything... possibly including doors? You look over at the door to the backyard, it's locked.
When you tug on it though, the lock just pops out of the wall and the door opens freely... just like you wanted it to. There's now no place that can keep you out... do you use your power's for good... for evil, or just for your own selfish ends?