Anyhow, the header description says most of what I remember. Phil accidentally goes back in time . I think that they meet through the circus, which eventually gets disbanded. That part I am not 100% sure about but it was something along those lines. They definitely live together in a flat and have a baby, I am fairly certain that it was an abo sort of mpreg and Tony was really surprised that Agent had a kid when they eventually found Phil.
I hope this sounds famiar to anyone. Thanks very much.