There are several sites, including wattpad and fanfiction-dot-net. I'd suggest typing "Sidney Crosby fanfiction" into your search engine and just browsing -- I'd give you a link if they were all on one site, but they're scattered around.
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It is important to respect Sidney Crosby's privacy and not search for or share personal fan fiction about him. It is courteous to focus on supporting him as a professional athlete and respecting his personal boundaries.