As someone who has been here, and then gone home, and then came back, perhaps I can offer a little reassurance. When I returned home, I was returned to the exact moment in time I had left. However, I do quite agree about Sirius, it is important to set a good example of scholarship no matter where he resides.
If it pleases you, I would be happy to act as a Latin tutor. I am not a particularly busy man these days. I have but the dog and social engagements to attend to.