In the beginning

Cas lived a hard life. She'd never seen the surface before and was a massive threat to anyone within miles. After government experiments with a new formula for imortality, Cas is the only to survive the effects but is massivly radioactive due to what was in the formula. But one day, a new recruit from the surface is assigned to Cas's section of base. After a few weeks of him observing her through the glass wall she is contained by, he slowly starts to fall into a trance. With effort and will power he helps her escape. Now that they are on the run, will this recruit re consider what he's done?