I would recommend a Satsuma tree. They do very well in Houston. I planted mine over 20 years ago and thought they were not too cold hardy. I covered mine for the first two seasons until it got too big to cover and it never loses it's leaves even when the temps dropped down into the single digits a couple of times. The fruit start out kind of bland but they get sweeter each year. The older the plant, the sweeter the fruit. I also fertilize with Epsom salt to enhance the flavor, at least that is what I was told by the old-timers here. I live 75 miles west of Houston. I planted three more but they are still young.

I also grow lemons and tangerines.

Most satsumas are slightly more cold tolerant than reg. oranges so consider that. Also easy to peel. Go to urban harvest website for popular varieties. You will likely have to throw a blanket or sheet over tree on freezing days. After 2nd or 3rd year, prob. not.

I agree with the above that a satsuma/mandarin would be the best. It would be good if you could get them on trifoliate rootstock. It has a a better cold hardiness than other rootstocks. Flying dragon is a dwarfing trifoliate rootstock that will keep the satsuma more manageable. Kishu mandarin is a very sweet citrus that is seedless. It does produce small fruits, but since it is seedless and easy to peel just eat more than one.