All 3 Uses

indulgent
in
The Screwtape Letters
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If any present self-indulgence on your part leads to the ultimate loss of the prey, you will be left eternally thirsting for that draught of which you are now so much enjoying your first sip.†
Chpt 5

self-indulgence = being excessively kind to or undemanding of oneself
...encouraging the belief that sickness excuses every indulgence...
Chpt 5 *

indulgence = extra kindness and tolerance
But, however you approach it, the great thing is to bring him into the state in which the denial of any one indulgence—it matters not which, champagne or tea, sole colbert or cigarettes—"puts him out", for then his charity, justice, and obedience are all at your mercy.†
Chpt 17

indulgence = treatment with extra kindness or tolerance OR (more rarely) a special pleasure (typically something done in excess of what is thought good -- such as eating too much cake, or being too lazy)

Definitions:

(1) (indulgent)
to treat with extra kindness or tolerance
(2) (meaning too rare to warrant focus)
In the form, indulgence, the word can also refer to a special pleasure--typically something done in excess of what is thought good--such as eating too much cake, or being too lazy