A not so average birthday

"I expect you home for lunch, though, boys. You won't want to miss your birthday meal, Kíli, and I don't want to explain to our guests that you got lost in the woods, either. Fíli, I'm trusting you to be responsible, don't do anything reckless and above all..." "Look out for Kíli, yes mother, I now." Kíli's 30th birthday doesn't go as planned. Hints of Fili/OC.