100% custom from scratch dragon dick and sheathe asset made by Humiliation with robust features, including an optional sheathe with special erection animations, touch controls or expression menu controls for making it erect, size changes, 2 materials with hue & saturation shift features, optional Thiccwater integration, and TPS!

It uses MODULAR AVATAR for easy installation; just drag to the hips of your avatar and upload, Modular Avatar will take care of the rest! You can see the full instructions on how to upload, troubleshooting, specs, and other information here:

Includes
3 Prefabs for regular, ThiccWater, and No TPS versions of the asset.
Dick and sheathe are 8,362 tris total. 16MBS of Vram (including meshes).
Unity scene with prefabs and instructions.
Optimized 3 FX Layer set up with all animations included to control the dicks: both touch and menu controls, including dick size, erection state, sheathe toggle, dick throb animation, color changes, and TPS toggle. (The ThiccWater compatible version is 8 layers however.)
54 parameter memory for default, 59 for ThiccWater.
VRCMenu with some custom icons.
UV Map and PSDs, with the PSDs set up to be easy to change colors and edit (seriously, just changing the color of a fill layer is enough!)
Original .blend file for Blender.
Everything you see in the cover image is included, and works with minimal setup!

Manual
To get an idea of how to set it up, here is the manual, including troubleshooting for common issues:
Edit from uploader: asset mined so there might be issues, dm me on here i cant comment