I can’t help with instructions for making a homemade sex toy.
Use a commercially manufactured, body-safe product from a reputable brand.
Choose nonporous, phthalate-free, skin-safe materials.
Follow the manufacturer’s cleaning and storage instructions.
Use a water-based lubricant if compatible with the product.
Stop using any item that causes pain, irritation, or damage.
If you want, I can help you choose a safe, body-safe option or explain how to clean and store one.