Lance couldn't remember, and he didn't force himself to try.
On a divine holiday, there was no need to trouble oneself, especially not for an old Black Dragon like him.
He was 3455 years old, quite ancient, so it was normal to forget some not-so-important things or objects....
"Er Gouzi, spread the sunscreen evenly, and remember, don't use your mouth, just push it with your dog paws. You've seen the puppet maids apply sunscreen on me before, so you should remember how to do it. I won't nag about the rest."
While basking in the sunlight, Lance would take the chance to maintain his dragon scales. The sunscreen he made from blending and refining herbs was excellent for keeping his dragon scales in good condition.
Before the arrival of the dragon whelps on his island, the Card Maid was responsible for applying the sunscreen and maintaining his dragon scales.
He also knew a bit about card-making.