In the movie "Love Left and Right", one of the 100 things that Leo Ku gave to Karena Lam was a magical color-changing cup. The color-changing cup is black at room temperature, but it will turn white as long as hot water (about 60 degrees or above) is added, and the pattern printed on the cup will also appear. You can give her such a personalized color-changing cup, print her photo on it, and promise her a lifetime! You can also print some special blessings on the cup, which should be a beautiful memory in her life.
Give her a box of handmade chocolates with love blessings printed on them, and hope that your future days will be sweet. Or give her a super cute teddy bear, hoping that she can keep a beautiful childlike heart. It would be even better if you add a necklace or bracelet designed by you personally for her!
No matter how long you have been in love, as long as you can always have each other in your heart, you will always be sweet.