Imagine your immortal!OTP
Imagine person A is a time traveller and person B is immortal. In year 1678 they met the first time and fell in love, though person A knew they couldn’t stay for someone who’d die anyway and person B couldn’t let someone mortal have their heart. Knowing this, B still gave A a silver bracelet, a gift symbolising their love and formed bond. Two month after that, A disappeared because they feared to watch B die, though they would come over every two years, watching B from afar and after 20 years B moved away. A believed them dead by then.
After nearly a century A and B meet again when they bumped in each other on the street. Both are speechless because they thought that their loved ones were already under the earth. Not believing that A is A, B tries to flee, but A grabs their arm and shows them the silver bracelet.