Do you want to ask in the caption "Is the allusion of "sending the king and grandson off again to love each other full of love" a reverse usage? No. "Send the king and grandson off to live happily ever after" uses the rhetorical technique of allusion, which is often seen in poetry. Common rhetorical techniques in ancient poetry include metaphor, comparison, metonymy, exaggeration, double entendre, parallelism, questioning, rhetorical question, allusion, intertextuality, list of poems, duplication of words, etc.