Bonesaw- Parasite Gun

Riley pulled off her apron, throwing it aside, dried her hands on the front of her dress, and then picked up a parasite gun.  The butt-end of the gun reacted to her grip, tail encircling her wrist before sliding a needle tip beneath her skin.  Once it was in, it forked out, fibrils extending up her veins, between skin and muscle until it reached the spot over her heart, where it drank greedily, a ‘vein’ standing out across her chest and down her right arm as the fibril extended out as a tube.

She tilted her face skyward as she felt a fibril go against the current of her jugular to reach up to her brain.  She’d added more nerve endings to the interior of her skull to be better aware for any works she did in there, and she could feel it finding its way.

She had a three-microsecond seizure as it made the connection.  Once it was done, the gun was an extension of her, grown from her own cells, with tiny hands going to work in the fluid ‘womb’ of the weapon.  For the time being, she worked to create an extinction-tier payout.  If she needed to change anything or if she wanted to create something, the process of creating any tinkertech smaller than her fist or any injectable drug was as simple as thinking of it and putting it to work in the micro-laboratory in her gun.
...

After a moment’s consideration, she thought up a good formula.  First, an encoded protein sequence that would become the right speech pattern…

A bubble floated from the bottom of the parasite gun’s housing to the top.
...

Riley de-catalyzed the extinction-level ammunition in her gun.  She let the fibrils recede, the ones that were engorged with her fluids dragging their way through her veins on the way back out.

- Ward, Infrared 19.z