Whai?As expected of Suwako-sama, such a deep meaning.Hmmm...Love...grief.
愛(love), あい(ai in hiragana), アイ(ai in katakana), and 哀(grief) are all pronounced the same. AI, ai,A pet animal...!
The first kanji of 愛玩(pet) is the same 'ai' as the one for love in the top right panel