for your first Gruvia story, this was AMAZING! you did a fantastic job on it! I would say add on another chapter but it feels complete and satisfying just the way it is! absolute no hate on this, because there's nothing to hate on, if I had to hate on something it would be the illegalness of fluffy feeling you put in my heart right now! please keep writing! ***~

Nice short story :) good luckies with your future stories :)

I would be in No Game No Life, because it's a world where conflict is solved through games :)

Coming from WA review game fandom blind. English is not my first language, so do correct me if there's something wrong with the suggestions below. :)

Opening
The first sentence can use a bit of tweaking to pack more punch. From what I see, there's something lacking with the parallel, too (referring to the [sun rays] with [it]). Perhaps you can do some splitting and reordering like [The sunlight hit Gray's eyes. Wincing, he blocked it with his own hand.] Just my suggestion, so feel free to come up with your own tweaks. :)
The edits aside, it's a fine opening. I don't have any idea how Gray suddenly wakes up beside crushed rocks, so I'm interested to learn more! I do suggest adding more descriptions to the surroundings, though. With a more specified setting, it can add to the sense of immediacy or grab the readers' attention better.

Plot
As a whole, this work is adorable! It's especially lovely when Gray admits how much he loves Juvia, because he has had a few instances of being unable to confess his feelings. Now, he finally musters up the strength and courage to say that he loves Juvia!
A few stuff can use more clarifications so that fandom blind readers will feel less confused. For example, [There were still marks from the last time he saw her, but they looked better] Perhaps elaborate what is significant with the marks? And the later part about the dry blood, you can also add what is significant with that feature.

Characters
Gray appeals to me the most. He's an introvert and can't really bring himself to confess his feelings to his lover (no matter how much he wants to). That's what that makes him rather alive as a character.
Also, Juvia is another good character. I like how you bring her character to life with her dialogue. Her third-person dialogue really gives her a naive and childlike personality. In addition, how she refers to Gray (the -sama honorific) further adds to the fact that she's young and naive.

Writing
At some places, the subjects don't seem to parallel the verbs, which make the sentences a tad hard to read. Like [his eye widened and began to look around frantically.], you may need a [he] between [and] and [began] to specify the subject.
Also, as far as I know, double dots (..) isn't a standard punctuation. Not a particularly big issue, but I find that there are a few instances of flip-flopping between the standard ellipsis (...) and double dots (..), which is a bit distracting. Best to stick with the standard ellipsis until the end.
Another punctuation note is that when you refer to a character's name in a dialogue, be sure to put a comma before or after it, depending on the placement of the character's name. Like [Gray-sama(,) you don't].
Another stylistic thing is that you don't need quotation marks to indicate thoughts. Just italics will suffice.
Whew, stopping the ramble. What's the best in the writing is the dialogue. Each character has their own distinctive voices, and they give them personality. Gray's stutter shows his awkwardness in confessing his feelings (an introverted guy, okay), while Juvia's third-person dialogue and -sama honorific, as stated above, shows how young and naive she is.

Ending
Yep, a sweet happy ending. Finally, they do know they love each other. I do get confused at this [Neither of them was deceased]. Maybe you're referring to [dead]? If so, replacing [deceased] with [dead] will work better.

Well done.

This was a really cute scene.

I need this. Canon pleaaaaaaase XD Mashima should draw something like this (LLL) was cute! I really loved it

that was so cute!