"Of course, what kind of head hovel would this be if we didn't have cocks?" said the salesman you had earlier put on a shelf.
"Now, if you decide to try our collection, you need to go to the room behind that curtain." You move your head toward the direction you were just told, and you see the curtain. You can't help wondering if that curtain was even there last time you saw, but you disregard that feeling.
You put on the salesman's head (as it would be quite difficult to navigate with both your hands busy carrying each head) and proceed to go trough the curtain. Inside, you find many shelves, similar to the ones in the other room, but filled with erect cocks of many sizes instead. You notice the cocks are also chalk white. "Why are they-" you start.
"White? Oh, that's because any cock you put on will automatically blend with your skin tone, so your choices aren't limited. And they are erect so as to better display their size." Replied the salesman. "Now, before you grab any piece, insert your member inside that hole."
You do as he said, not thinking about the little dejà vú you feel as you insert it. "Don't leave the balls outside... good, now press the red button next to the hole." You do as he said.
*snikt*
You stare dumbly as your own cock and balls fall into a basket underneath the hole, the process as painless and bloody-less as when your head was cut, leaving you with a smooth patch of skin on your crotch. You grab your cock, i feels good to touch it, and it no time at all you're holding an erect member in you hands (you wonder were it got the blood to do so but hey, your head is also alive). You wonder if it could cum like this.
"As with your head, you can't reattach your member, so you can go and attach one of the ones in the shelf. You can also attach two or three at the same time, the number depends on how well you organize them, you could even attach seven if you manage the get them there!"
"Wait a minute!" you yell. "What will happen to my original parts here?!"
The salesman smiles at your head. "Oh, I thought you'd never ask!"