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MMlb, or Mother Matron/little boy, is essentially the femdom/malesub version of a DDlg dom/sub BDSM relationship where the Dom, often female, takes on the role of the "Mother", and the sub, often male, takes on the role of the "little boy".
"In their MMlb relationship, she lovingly punished her little boy for his insolence, with a stern, yet caring, spanking."

"Come to momma, my little one."
by ADrunkenPyrate January 23, 2017
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