一贱钟情两狗相悦
[yī jiàn zhōng qíng liăng gŏu xiāng yuè]
'Love at First Disdain; Puppies Mutual Pleasure' humorously illustrates developing feelings after initially seeming incompatible or even disdainful towards each other—similar conceptually to 'hate turning into love.' Plus, includes playful pets aspect adding cheerfulness.