Yes, the injections are permanent.
If you saw a different picture, maybe you saw one with the foreskin unpulled. That's probably why the cock lokked different. That clearly shows that the foreskin itself is somewhat thicker: that's the effect of the injection.
There are two other girls of which I know the names that have a siliconed cock: Adrielly (the one in the attachment) and Noami (
here she is). I personally don't like either of them, but I posted the pics 'cause you asked.
In
this topic you can find another one, but I don't know her name.