sweet nothings
From Longman Dictionary of Contemporary Englishsweet nothingssweet nothingsLOVEthings that lovers say to each other a couple whispering sweet nothings to each other → sweetExamples from the Corpuswhispering sweet nothings• How musical the river and how charming the trees whispering sweet nothings as we pass!• Ned appeared to be whispering sweet nothings in her ear but his attentions were being met with a stony silence!