I noticed Angus and Kevin from Round and Round are in Rekindled Flame. Also Peter, Darryl and Billy from the Love series make an appearance in the Fire series. Do you have a chart of which characters from which books do crossovers?
I don't keep a chart of characters who cross over from one series to another. However I can tell you some of the books that have Easter Eggs in them. For those of you who don't know and Easter Egg is a character form one series who makes an appearance in another.
Rekindled Flame takes place in the same universe as the Bronco's Boys series. So you will find a number of characters that cross over. It is the start of its own series, but the various characters make an appearance.
In Burnished by Fire some of the characters from the Taste of Love series make an appearance as secondary characters as you mentioned.
I'll give you one other. There is a character from the Farm series who transitions to the Range series.
There are also characters from In Search of a Story who appear in A Heart Without Borders.
I love adding these crossovers to stories. I'm trying to think of others and there are probably more, but I'm coming up blank at the moment. So if you know of others that I didn't mention, comment on this post to tell others.
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