How Did the Water Hashira Commission I Took Turn Out to Be the Actual Person?

What should I do when I arrange to meet an introverted requester, but the cosplayer looks exactly like the character?

I'll be outgoing for love. I'll greet "her" with, "Hey, hubby!" repay "her" beauty with enthusiasm, fill the awkward silences with chatter, and ask "her" to eat to her heart's content...

But...

Halfway through, I suddenly realize that several new messages the requester sent this morning haven't shown up. They've been buried under a whole day's worth of work messages, one after another. She said she'd suddenly had an asthma attack today and was taken to the hospital. She's still lying in a hospital bed and can't make it.

Th-then who is the person in front of me?!

Reader's Guide:

1. First-person narration. The pairing is probably Giyu Tomioka, but there will also be parts featuring Douma and the Tokito twins.

2. An impulsive work written after rewatching the anime following the movie. No outline, updates whenever inspiration strikes.

3. Both crossovers in both directions. Probably a happy ending.

4. OOC warning!!!

Theme: Never give up.