This letter suggests a mutual piercing or tattooing as a way to cement your bond.
I think you're really fantastic, and I want to suggest something that I think will bring us even closer. I'd like us to get <pierced/tattooed> together. I know a very safe, licensed shop we can go to and pick out matching <adornment you have in mind>. I think it would be the perfect thing to show everyone how much we love being together and how we're committed to our relationship. Please give me a call and let me know how you feel about this idea. I think it would be really great.