Specific sterek secret relationship fic
I'm 90% sure the story I'm looking for is sterek. All I can remember is that when they eventually get together they decided to keep their relationship secret because of the age gap, so towards the end there's a time jump during which they have been secretly seeing each other. After about 3 years they finally tell their family/friends, but they pretend they just ran into each other and started dating. Derek may have been Stiles' teacher and Stiles may have been magic which is what helped them meet up easily during the gap, but I'm not 100% about those details.