After seeing Blaine
propose to Kurt, Sebastian is… distraught. He realizes that in many ways he is
responsible for Blaine never loving him, but he also wishes he had the chance
to know Blaine before Kurt. In fact, he feels like he has to know how things
would have turned out if it wasn’t his destiny to fail. He finds a professor, Dr.
Andrews, and asks him questions about time travel. Andrews reveals that in fact
he has a way to change the past, and although he warns Sebastian about a high
cost, Sebastian takes the opportunity. Thus, Sebastian is plopped down into a
universe where he transferred to Dalton at the beginning of Blaine’s sophomore
year, before Kurt, but quickly alienated Blaine and so must earn his forgiveness.
Now, he just has to shift the course of destiny further, and hope that it doesn’t
destroy him and Blaine in the process.