orthographic and perspective camera overlay

Hello,

I currently have 2 cameras; 1 perspective and 1 orthographic. I made a script that lets the user draw on the screen. I have zero experience with cameras so it's really hard to explain :\ My problem: When I draw, it draws on the screen of the ortographic camera and not on the perspective one.

visual:

code:

    public Camera camera;
         
     // Update is called once per frame
     void Update () 
     {
         var pos = camera.ScreenToWorldPoint(Input.mousePosition);
         print(pos + "--" + Camera.main.ScreenToWorldPoint(Input.mousePosition));
         pos.z = camera.transform.position.z + 5;
         transform.position = Vector3.Lerp(transform.position, pos, Time.deltaTime);
         
     }
     
     void OnMouseDown()
     {
         gameObject.renderer.enabled = true;    
     }

EDIT: So while working on something else, apparently I moved my ortho camera. When I tried drawing again this morning, it worked a lot better than yesterday. I guess it didn't work yesterday because the position of my ortho cam was off. It now looks like this: http://i46.tinypic.com/o5nd3b.png

I have another question though. The lines I draw actually go through the gameobject I have placed in my scene (http://i50.tinypic.com/2uohnk0.png). How can I draw them in front of the objects without changing the z-axis of where they are drawn (because changing z-axis makes the line wider / thinner).