I only put milk and sugar in my tea, when I feel like having something sweet after dinner, or a meal. And then I don't even use real sugar. I use a sprinkle of Truvia, or Stevia. AND that all depends on what kind of tea I am having in the first place! Some teas should never be diluted with milk and sugar (or so I believe). ^_^
But the point of this whole post, is that I mix the water and tea-bag together in a separate mug, letting it sit until the desired strength. While that's going on, I mix the milk and sugar together in my main mug. I pour the delicious still hot tea, into the milk and sugar(sweetner, w/e) and enjoy.
EDIT: Oh that reminds me. When I am sick, I only have tea with honey and a lemon wedge!
Mmmm Tea.