A Surprise to Hold Onto(a sonamy story)

(I know people like sonamy so I'm doing this. .0. Bear with me. First sonamy related thing I've done.)
Amy Rose was waiting for Sonic, as always, wondering if he had stood her up on their date once again. When he arrived, he handed her a letter from Sally in which he was not permitted to open. Puzzled, Amy opened the letter once at home and upon reading it found it was about Sonic's upcoming birthday. The story centers around preparations and shocking things that can happen, you'd think preparing for someone's birthday would be easy... But when it's the hero of Mobius.. That doesn't apply. But what Amy doesn't know is that she's in for a shock as well, but what? Find out in "A Surprise to Hold Onto."