How about a soap making kit that he can customize and create his own scents and designs? There are many different options online ranging from beginner to advanced level kits. You could also add in a book about soap making techniques or a set of essential oils for him to experiment with new scents. Another option might be signing him up for a local soap making class or finding a local artisan who he could learn from in person.
Or you can get him a star map with the date of your first kiss.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.