Delia Huddy’s 1979 Time Piper is the first volume in a duology (Tom Humboldt’s Time Machine).
Eighteen-year-old Luke Crantock first encounters Hare Bingley as she flees a group of local bullies. This fails to serve as a meet-cute for a couple of reasons. Firstly, because Luke discovers that he is too cowardly to intervene; she has to escape on her own. Secondly, because Hare, on her part, isn’t at all interested in forming personal connections.
Nevertheless, Luke cannot stop thinking about the beautiful young woman.