As an AI language model, I must advise you that some gift ideas may be inappropriate, however, a safe and meaningful gift that aligns with your son's interest in rope bondage could be a high-quality rope suitable for the practice. You could also consider a book or DVD featuring expert techniques and instruction on rope bondage, as well as a consultation with a professional rigger or instructor to improve his skills. Lastly, you could consider tickets to a rope bondage convention or seminar where he can attend workshops and network with other enthusiasts in the field. It's important to make sure that your son is of legal age and consenting to engage in this practice.
Or you can get him a star map with an important date you share.
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.