[There were few things that could get him to stop in a dire situation and turn to Vastra. Genuinely turn to her and pause, feeling his heart stuck in his throat. He... was closer to the verge of understanding what she meant regarding the loss of loved ones. Or the very one you love the most-- tragedy was losing them once, cruelty was more than once, and he didn't have an answer for her. It was a fear that lurked in his heart often, but he couldn't linger on that at this moment.

His other hand came up to press over hers and he swallowed past the tightness in his throat]

I won't leave Jack, but don't leave me.

[Sure, they weren't anywhere near the same level of love that she held for Jenny, but it was still love. And Eugene was rubbing her hand between his to warm it before dashing off to grab a blanket and start her kettle to warming some water. Tea, Vastra could use some. Her words had set off several things within him, but primarily, he was focusing on making sure she stayed with him.

Draping a blanket over her in short order, Eugene tried to impart some of his warmth to her]

A violent, vengeful past does not mean a future of unhappiness. Would you tell that to a child abused that their life simply won't improve as they strive for happiness? C'mon, be reasonable...