love adds a little chocolate

In the book Love Adds a Little Chocolate, Linda Andersen writes:
Duty can pack an adequate sack lunch, but love may decide to enclose a little love note inside... Obligation sends the children to bed on time, but love tucks the covers in around their necks and passes out kisses and hugs (even to teenagers!)... Duty gets offended quickly if it isn't appreciated, but love learns to laugh a lot and work for the sheer joy of doing it. Obligation can pour a glass of milk, but quite often, love adds a little chocolate.