5. In The Dark
The pain meds wear off slowly. He's lying in bed, and she's still next to him, holding his hand.
He knows Abby's not sleeping.
And he knows there's nothing sexual or romantic about this. He's hurt. She's scared. They're best friends. So, it's dark, and it's night, and they're both in the same bed, not sleeping.
Just being near each other is enough.
He's told Abby he loves her before. In fact, he's told her three or four times a year for probably the last five years.
Sometimes it happens when she's broken the case and he's feeling grateful. Usually, it happens when he just wants to let her know how she's his best friend and how happy he is to have her in his life.
The first time, after Cassidy was killed, was a little awkward, but after that, it's just flowed. Between his dad and Gibbs, McGee has spent more than enough of his life around strong silent types who don't express emotion. He's got no desire to be that guy himself.
Though he suspects that even Gibbs manages to regularly tell Abby he loves her. Because she's lovely and because she's just makes people want to be happy, and spread the happy around. Even Gibbs has to melt in the face of how warm Abby is.
He squeezes her hand gently, and feels her squeeze his in return. Eventually, he drifts off to sleep, Abby holding his hand, by his side.