Need help plotting revenge against a person i thought was my best friend, here's the scenario:
>be me
>have qt slightly spergy gf for 5 years
>third wheel friend we have gets into some degenerate succubus jackoff instructions app
>is very open about it, even tho nobody gives a shit
>yesterday
>friend texts gf if she could give him instructions
>plays alomg to humor him
>no pics excanged
>this morning
>he texts her an unprompted dic pic and imnediately regrets it
>gf feels bad and tells me

I'm sad and furious, he knows that i know at this point and is freaking out

What can i do to make that limpdick cockroach faggot suffer?

Idea i had so far was ban him from our hangout discord (with his friends and family on there) and make an announcement about his sexually harassing my gf

I know gf isn't 100% out of this but i'm more angry towards the person i thought was my best friend

Fucking twitter and their degenerate spiral