One day the US Air Force had enough and sold a XB-70 Valkyrie to your family, somehow she ended up in your possession...

One day as you're getting ready to go home after school, your XB-70(she naturally accompanies you as she decided herself), is right next to you, her being 11 feet tall in her aeromorphic form, walking right behind you.

She was very nice to you(willingly), she was quiet, although there was the slightest blush, she was grinning, showing her "shark teeth" of hers.