All 3 Uses

indulge
in
The Phantom of the Opera
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We began to laugh again, feeling sure that they were indulging in some joke that was intended to crown our little entertainment.†
Chpt 3 *

indulging = enjoying to excess
And then he induced Mamma Valerius to indulge a queer whim of his.†
Chpt 5

indulge = enjoy to excess
He had been indulging in this healthy exercise for half an hour or so, when a carriage turned the corner of the road and came quietly in his direction, at a walking pace.†
Chpt 8

indulging = enjoying to excess

Definitions:

(1) (indulge)
to give in to a desire or allow someone to enjoy or experience something -- especially something pleasurable
(2) (meaning too rare to warrant focus)