The bros are all in a loving, consensual relationship. Prompto is their newest addition and the only one that doesn't live in their quarters. Prompto is babied by the others because of his shy demeanor and low self esteem. However, the others quickly start to notice that Prompto always wants to be held, eats extremely large portions while at their place, and always seems reluctant and scared to go home.
The guys start to investigate Prompto's home life and discover that he lives with a foster family in a dangerous part of Insomnia. The others decide to drop in unannounced one night, and discover Prompto beaten and chained to the back porch in the middle of a snowstorm. The bros rescue him and rush him to the citadel where they nurse him back to health. Prompto eventually breaks down and tells them about the horrible abuse he suffers at home and that he can't leave because he has nowhere to go and no money. The bros immediately move him into their quarters and give him anything and everything he's ever wanted.

A/N:....yeah I'm pathetic. I just want a lot of hurt/comfort and sap. Pampered and doted on Prompto is a major plus.