You're both poor, he asks you for money and he spends it for porn.

This is the important part.

"teen" means nothing too old, not kids. Maybe he's bicurious or maybe bi tout court, or maybe even straight with this kink, not all the craziness you're talking about. You're blowing this part out of proportion and not focusing on the important part, the money lies about it and subsequent broken trust part.

He's living off you while spending your money on his private things. Focus on this.