Billy and Erin

The relationship between Erin Healy and Billy Gellar are known as "Brin" (Billy/Erin).
==Relationship History==
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==Timeline==
*Friendship/Attraction
**Start: First book of Twin Diaries
*Relationship
**Start: Valentine Hearts
**End: Goodbye Middle School
***Reason: Unknown
Category:Couples
Category:Couples from Twin Diaries