It is quite normal to need these feelings in your life -If you're just taking the device away and repressing the behaviour, where's the outlet? What alternative way have you given him to have those feelings?
It's impossible for you to come up with an answer for that of course; how we get involved with the people we like and what we like them is a very personal thing.
And it's not Discord itself, that's just a method of communication, in my day it was Yahoo chat. You might even be cutting off other forms of social interaction he has if he's formed other friend networks through there. You'll have to check that for yourself by talking with him.
Likely because he's so introverted, online chat is the first real intimacy he's had with a woman, and I'm speaking from experience . When I was a teenager, I was not encouraged to go out and make friends and given a good model of how to socialise at the time (though I think my parents did their best, they just didn't know how to do any better), so I had a similar experience, and I guess I'm lucky they just never found out. In the end, due to external messaging from society, I found my own drive to move out and grow as a person. Not everyone is so lucky though. The lucky ones have parents that have the urge to give them examples of how to socialise, either consiously or not, by having people over, family gatherings, going out, etc.
This boy needs direction, it's not enough to say he's introverted and leave him alone, he needs a good model for how to go out and make real life connections instead of semi-real ones online.
Your son might be the only outlet for this girl's sanity, and while on one hand some other random family's problems are not yours to bear, on the other hand this could be a very important relationship to him and his development. This is his first intimate experience, and the feelings he will associate with this by you cutting her out are going to affect his development whether you like it or not. At the same time, you're right about being concerned about the level of inappropriate influence, but the flood gates are opened, you won't convince him this is a "bad" thing now, it feels too good.
And his care for her welfare won't go away with you banning the device either. He will always wonder what happened to her and resent you for it.
I think it's very possible you're too worried about the content of the messages and it's possible that cutting her out will do more damage to his social development than whatever fantasies they are exploring. Again, speaking from experience.
The long term importance is he learns to move towards having connections with people in real life, before he gets addicted to what he knows. Again, speaking from experience. It wasn't too bad, I just had to change what gets me "turned on". I was too used to imagining it instead of doing it.
In my opinion you should talk with him about what is appropriate for his age and what he needs to work towards so he can experience these things in real life. It will be a transition. One of the big realisations for me was when one of my online girlfriends was moving on, and told me "You have to find real people, that you can touch and hug for real". Something to that effect. It didn't happen instantly but it was one little thing of many things that caused a transition over time.
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