Hips, Lips, Apocalypse by Tylor Paige

What good is a Young Lady without her DADDY?

Down in Bunker 237, safe from the atomic bombs, Eleanor is part of the Young Lady program. Paired with their DADDYs, older male soldiers turned personal bodyguards, they go up to the surface in search of items that could help the general population one day survive above. Eleanor is the smallest, yet best ranked Young Lady in the program, and makes sure everyone knows it; but when her DADDY gets wasted on a mission, everything goes south fast. Eleanor is assigned a new Daddy, Callahan, and with that comes new obstacles. How does an adult Young Lady bond with a DADDY that’s the same age as her? One that’s incredibly handsome, strong, and has an attitude that matches hers.
On the surface above, Riot Ritalin holds court at Heathen Heights, one of the few homes with running water. Fixing up junk during the day and finding men and women at the bar every night to take home has become routine. He has no intentions of changing things, until he meets a Young Lady from the bunkers with one request. Get Eleanor out.

On a mission to find Eleanor, he finds Callahan, and now he has a new mission. Get them both out, and make them love Heathen Heights and himself enough to stay.