我愿溺你深海直至死亡
[wŏ yuàn nì nĭ shēn hăi zhí zhì sĭ wáng]
'I wish to drown you deep in the ocean until death' should not be taken literally but rather figuratively as expressing intense, perhaps overwhelming, and self-sacrificing devotion where the user sees their feelings akin to a deadly and deep force like drowning in the abyss of love.