Although I could not do justice to this couple in my story due to my poor writing ability, I am feeling relieved.
Non-violence is the greatest Dharma; So too is all righteous violence
Yes, we should treat ourselves for achieving something (big or small is a different issue). For instance, Mr.Partha has penned down a nice story, he would and should feel happy and then go on to do a next one, he would be motivated by his success to do better next time and the next time.
I think we should succeed, enjoy the joys of winning, take a short break and then use that as a motivation and moving on to the next target or task and avoid going back to the lazy mode for a long time. Lastly, it's important not to allow success get into our heads or feel very contented. A contended man seldom challenge himself to his true extent.
"Do not give up, things might not favour you always"
Do what inspires you !!