It is possible.
And I dont get how the whole idea of self gratification is bad that is like saying anything that GRATIFIES YOURSELF is a sin. So yes taking care of children is now a sin? Singing is now a sin? Loving god is a sin?
Because all of those things
Dictionary.com-
1.
the state of being
gratified; great satisfaction.
2. something that
gratifies; source of pleasure or satisfaction.
3. the
act of
gratifying.
4. Archaic . a reward, recompense, or gratuity.
So on those terms if serving the lord is a sourace of pleasure and satisfaction for you. It is a sin. I am pretty sure that is false.