Lyra loves Bon-Bon very, very much.
Enough, in fact, to overlook the cream-coloured, beautiful-voiced, wondrous-smelling mare's raging, overwhelming, caricatural homophobia.
This would be the state of the union; Pinkie Pie, however, being as she is, thinks all this 'unrequited love' nonsense is nonsense for silly fillies and dusty old books, and as such decides to intervene.
Background PinkieDash.