Now, it is Sunday. Lord StarLight asked you to accompany him on a trip to buy groceries, a chance to get out and about you could say.
Either he needed to get groceries or he just wanted to spend time with you outside the castle.
I suppose it's up to you to choose what you believe.
However as you left, one of the servants asked Lord StarLight to take a weapon with him just in case. And he did, bringing both a knife and a gun with him.

[WARNING: THIS CHAPTER MAY RESULT IN LORD STARLIGHT BEING INJURED]