What I liked most in this story was the humour that surfaced every now and then. A few of my favourites:
It took Harry a few moments to fully realize what was going on. His mind provided him with all sorts of explanations that made no sense at all. Perhaps the ocean had spit Snape back up onto the shore, and this was his way of ranting about it?
"Bloody hell," Severus muttered, barely catching Harry as the boy drooped into his arms. If he'd had any doubts that this was the real Harry Potter, they'd been erased by the fact that the boy needed to be saved - again.
Now, with the first light of dawn coming in through the window, he found himself paying for his indiscretion: Severus Snape, lying curled up in the arms of a nineteen-year-old Harry Potter.
The art is lovely. Harry looks very content, and Severus, although a bit apprehensive, is ready to be convinced that Lily was right, after all. I like your version of them a lot, and it’s great to see them in colour. Severus’ pale face is gorgeous.