Journal of a Russian Imperial Guard soldier. Alexander Palace, 1913.
'...I accompanied Tatiana, Olga, and Marie to the grand staircase where they bade me goodnight before retiring to their rooms. Anastasia was behind me, visibly sad because I never danced with her. I offered her my hand. But instead of returning to the ballroom, she happily took me outside, where we danced in the garden. We relaxed on a bench afterwards, during which Anastasia snuggled on my shoulder. We were still holding hands. I carried her back to the palace when she dosed off...'
That it is fan fiction struggling to be historically accurate is evident from the nonchalant use of first names. A Russian guards officer (NOT a soldier!) would either refer to OTMA as "the grand duchesses" / "Anastasia Nikolayevna" etc. even in his diary or, if he actually was romantically involved with one of them, as "A" or some diminutive or nickname. The casual, modern mode that use of mere first names indicate (e.g. "Hi, Olga! What's up?") was not a possibility - it was either formal, but cordial ("Good evening, Olga Nikolayevna") or intimately affectionate (when you got to the park bench!:-). Even in their journals and diaries people in this age and in this environment took certain precautions, as there always was the possibility that their journals would be read by someone else.
Another example from the beginning of the entry in question:
Winter Palace, February 1913
A luxurious ball was held in the capital to celebrate the Romanov Tercentenary.
I don't think contemporaries writing casually in a journal would refer to it as the Romanov Tercentary, but as the Tercentary of the dynasty or the imperial house. To contemporaries the Romanovs were not 'the Romanovs', but THE one and only Imperial Family! And they would certainly NOT venture out of the Winter Palace into the garden (which?) in February for a tête-à-tête! Of course not even mentioning that Anastasia Nikolayevna wouldn't attend any state balls at the age of 11!
Another one:
Alexandra instructed us to remove the imperial insignia from our uniforms to avoid provoking the rebels when they return.
God, this is almost as bad as "my sexy crush Anastasia's MILF mom"!!!
The Empress, please! (Or Alexandra Fyodorovna if you are a
habitué of the Mauve Boudoir.)