Pen Shell made her living scavenging the nearby beach for beautiful shells in which to craft jewelry as a living, she has become a bit of a tourist attraction at her booth in the harbor’s market square. One day, the alarm horns sound around the minor shipping port when a large sea serpent had been sighted by the pegasus patrols as it seemed to be chasing something. Pen Shell was just far enough to hear the wailing alarm when she galloped back home to avoid finding out the reason for the alert, only to come across a violet blue siren pup snake her way haphazardly across the road. Already distressed by the harbor’s security system, the little hatchling froze in place when Pen Shell happened upon her.
 
Though rather than panic or run in any other direction like most ponies would, Pen’s maternal instincts kicked in when she saw the utter despair and terror in the sirens wide eyes. Whatever had the pup out on her own was not something she wanted to find out nor did she wish anything upon the merpony she suspected it was. Using careful movements and a soft soothing voice, Shell managed to close distance with the pup and eventually embrace the youngling who surprisingly took to her harmless gesture with gusto. With the fear dispelled and the warning alarms still hounding loudly, Pen threw the pup onto her back and took her home where though she tried to find her mother there was no success in the attempts from notices to active searches where she stumbled upon the little filly.
 
Since then the pup had taken to her naturally and became an adoptive daughter of the sorts loving any and all interaction with her new surrogate mother. In a ways the pup even increased the mares profits by being able to swim out to sand bars for more prized specimens which shone beautifully in Celestia’s great sun. After a few years the two were soon of the same height, but to Shell the hatchling was much her own as if she carried and birthed her herself. Every morning walk to the beach had become less of a part of her way of living to blissful heaven and joyful talk with the young siren.