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Abbr. on a love letter, 4 letters
Abbr. used with lipstick marks on an envelope, 4 letters
Acronym on love letters, 4 letters
Affectionate care package abbr., 4 letters
Billet-doux acronym, 4 letters
Billet-doux letters, 4 letters
Initials on a love letter's envelope, 4 letters
Letters in lieu of a lipstick mark, 4 letters
Letters on a love letter, 4 letters
Letters on a love letter's envelope, 4 letters
Letters on love letters, 4 letters
Letters on some love letters, 4 letters
Love letter initials, 4 letters
Love letter letters, 4 letters
Love-letter acronym, 4 letters
Lovey-dovey code msg., 4 letters
The S in this stands for sealed, 4 letters