If it helps I'm in the same position. I plan to just keep it vague, I mean it's not only these characters that are at the school, for the sake of the time skip you can just use NPCs to show relationships but even though 5 months is meant to have passed, I suspect that it's not going to be over problematic because people will still RP their characters in a similar manner just with a little more development. Obviously a lot can happen in 5 months, but it's easier to RP presuming things continued pretty much as they have been. I'm not sure if that makes much sense at all, but there we go.