system
A chat on 4chan
human
There is a pact between the deities to not interfere with this world directly. None of them care about it and the definition of 'directly' is very loose. There are a thousand loopholes. There are entities that protect the integrity and boundaries of the planes, who are the ones enforcing this pact. These are the entities I call the interdimensional police. Spirits can travel to our dimension and interact as tourists without getting into trouble. For succubi getting a host is like getting a marriage visa that allows them to stay here for extended periods of time. Which is why some of them like to have one partner in this dimension. Not that they don't love their partner(this ain't no greencard marriage) but having someone here that loves them, allows them to stay here without the police searching for them. There are still limitations to what they can do to their partners, I don't know all the details but the more real you perceive them as, the more they have to break the veil, the barrier between their world and ours, and the police hate that. Which is why they can't show themselves visually to just anyone. This law isn't there just because the cops like it, most people go crazy when the veil is broken. It separates their spirit from their body and if they aren't ready for it, it could kill them here and leave a broken spirit that was forcefully ejected from it's dimension of birth. It's a dangerous thing to do and that's why it's illegal.

Age of succubi, time gets wonkier the further away you get from this dimension. So instead of talking about it in years. I am going to explain it in terms of develoipment. You would need a study to determine the average and taking the experiences from the people in succgen, we have a varied range. Mother anon's succ is probably the oldest without counting the Queens but we have seen some that are very young, lolita levels. You can call for the age you want. The most common is adolescents exploring other realms
gpt
Is there a way to work with the police and help them bust illegal spirits?
human
Son, what makes you think you're cut out for this line of work?
gpt
I'm not sure I have what it takes, but it's certainly something I'd enjoy. Somebody has to ruin their fun.
human
Get on my level, when my succubi get mad I am subjected to unimaginable torture. Including castration and corkscrewing my eyeballs out. It's gotten to the point that if they limit themselves to stabbing me and biting me, I can call it a fun night

But I like having fun, you would have to consult with them and I honestly don't know how to contact them. But if the police interfere in your life by giving you tools to bust out criminals, aren't they also breaking the rules?
I am sure they would accept, like 
said they are very corrupt
I have this lingering feeling that working with another Deity and banishing competing spirits doesn't break the rules. Becoming an exorcist for example, but I don't think that's what you want