Trying to get a tgirl to cum is like the tech priests trying to use ancient technology.
We don't know *how* it works, but we do know if you light the psychoactive incense, chant the holy litanies, invoke the Omnisiah and lube up the machine spirit in oil before hitting it with a wrench, it'll work.
Trying to get a tgirl to cum feels like how the doctor needs to run around the TARDIS controls and hit it with doohikeys and shit to make it go since it wasn't designed for just one pilot. You gotta sproink on the thingamajig sometimes that's just how it is