It’s the first time I read a “monster romance”
Xavir leaves letters for Mia as he admires her from far away. She falls for him based on his letters, she waits one day until he’s dropping off his letter to offer to meet. She is surprised that he’s been watching over her, they officially meet and she becomes his wife and mate.

Pen pals
Spicy
Novella
Dual POV
Yearning