Lydia and Stiles have been sharing an apartment for two years when Lydia is invited to her cousin Jade's wedding. (Not so) Accidentally, Jade is told that Lydia will be taking her boyfriend as a plus one, but truth is Lydia is actually single. The duty of having to pretend he's dating Lydia falls, of course, on Stiles, but as it turns out pretending isn't really that hard.