When Tom's wand changes allegiance

Allegiances by Divida is a same age tomarry set in an alternate magical timeline where Tom and Harry attend school together. During Lockhart's dueling class Tom is paired up with Hermione. When she gets injured because of Tom's little machinations, Lockhart pairs Tom and Harry together for a duel. Tom obviously has no idea how good Harry is at dueling and that just sparks the beginning of things for them.