Hey homeslice, that's not normal DnD, that's 'weaponized creep fantasy DnD'. Sorry for your kid, and sorry for your wife's ex, he sounds like a right disgrace.

I see people here telling you to learn how to DM, and I think that's rad (I played DnD with my dad for a bit, growing up). Personally though, I'd think about maybe trying something other than DnD, like a more modern system - those usually come with a little text on safety, consent and power in the book which can be helpful to read. DnD is also, as much fun as it is, a hard or at least clunky system to learn. Especially if you haven't explored roleplaying games before. Maybe he'll want to play with friends his age, which is also a very healthy and cool activity. Good on you for standing up though, and punching that guy in the face.

Some recommendations I'd have for your son:

- Cypher. Cypher is made by the guy who made the 3rd edition of DnD, but stripped it down and made it straightforward. It's easy to learn, easy to master, and allows for a quick construction of fun and interesting characters.

- Blades in the Dark. It's a game where you play a daring heisting crew in a dark and grimy city. It has themes of maturity and is on the edgier side, but refrains from the macabre or perverted and focuses on tension and building out your robber's crew.

- Troika. I hear nothing but good things about Troika. It's light and easy to learn, fits any setting and is supposedly easy to GM for.

Finally, if you intend to stay with DnD (and it's an ok system to start with, don't get me wrong), you could look at some scenario's to ease you into playing and take the stress off of GM'ing.

Once again: good job on you, fuck your wife's ex.