Flowerfell~Don't Leave Again Sweetheart

Darkness was the last thing Frisk saw before dying. The last thing they heard was Sans telling them he was smiling for them.
The last thing they felt was Sans tears dripping onto their cheek.
The last thing they thought was to tell Chara they did the right thing.
Only... It wasn't the last thing they did, saw, thought, and felt.
Somehow they're back from death with half their body covered in flowers.
As Frisks makes their way across the Undergrounds they have a feeling something is different from last time, but they can't quite put their finger on it.