Cover credit:SepticGirliplier At first Stiles didn't mean to intrude but now he finds it fun to crash Derek's lectures. Especially when his students gossip about Derek to stiles because they have no idea he's Derek's husband. But the longer it goes on the harder it is to hide from Derek while he teaches. But once Derek catches on to stiles's little scheme without him knowing he gets revenge on his oblivious husband.

Or the one where Stiles is Derek’s mate and doesn't even realize it.