Was going to slather this with some cheesy sentiment and make it look like an actual valentines day card, but my inner graphic designer was having a fit.
True love is accepting someone, warts and all. Lyra might be a bit... eccentric with her emulation of the activities of "humans", whatever they are, but Bon Bon sees in her a fine mare she could spend the rest of her life with. And though Bon Bon might be a bit... abrasive at times, Lyra feels the same way.