Unity2d: Object either moves too fast or too slow

Question

void MoveSteps(float speed, int steps)
{
        isMoving = true;
        if (GameObject.Find("Camera").GetComponent<room>().playerNum == 1)
        {
            if (Input.GetMouseButtonDown(0))
            {
                Debug.Log("clicked LMB");
                Vector2 mousePos = Input.mousePosition;
                mousePos = new Vector2(mousePos.x, mousePos.y);
                Vector2 worldPos = Camera.main.ScreenToWorldPoint(new Vector2());

                Debug.Log("COROUTINE: MoveSteps smooth steps process is called");
                int counter = 0;
                while (counter != steps)
                {
                    transform.position = Vector3.MoveTowards(transform.position, mousePos, 1);
                    // yield return new WaitForSecondsRealtime(0.0000001f * speed);
                    counter += 1;
                }
            }
        }
        isMoving = false;
}

Above is my code to smoothly move my square to the mouse. But this moves too fast.

IEnumerator MoveSteps(float speed, int steps)
{
        isMoving = true;
        if (GameObject.Find("Camera").GetComponent<room>().playerNum == 1)
        {
            if (Input.GetMouseButtonDown(0))
            {
                Debug.Log("clicked LMB");
                Vector2 mousePos = Input.mousePosition;
                mousePos = new Vector2(mousePos.x, mousePos.y);
                Vector2 worldPos = Camera.main.ScreenToWorldPoint(new Vector2());

                Debug.Log("COROUTINE: MoveSteps smooth steps process is called");
                int counter = 0;
                while (counter != steps)
                {
                    transform.position = Vector3.MoveTowards(transform.position, mousePos, 1);
                    yield return new WaitForSecondsRealtime(0.0000001f * speed);
                    counter += 1;
                }
            }
        }
        isMoving = false;
}

Now it seems that there is a limit to the short-ness of the float in the WaitForSecondsRealtime. This moves slow and no matter how small, it caps at some number and then will not move faster. Any help?