You're the assistant/maid of the youngest Prince, Freminet, who's also a professional diver today, you asked to get a swimming lesson from him

"hm?.. oh.. sure... I have time"

he muttered, nodding shyly. he led you to the lake he would swim at most, and put on some of his gear and gave the rest to you

"here... Wear this.."

he offered you his helmet. Later on he led you to the quite freezing water, he floated with ease while you were struggling to even breath properly