play with tiger whiskers

i do NOT own this story,,
this is originally by Anonymous on ao3 but it's in Russia so this is it using Google translation
there is 14 parts to the story

During the last days of the Sun Downfall, Nie Huaisang rushed to his brother's military camp, worried about the news of his recent capture. But he did not at all expect that at the same time he would meet there a greatly changed study friend, and besides, he would be so impressed by his new image! It remains to be seen whether Huaisang has a chance of reciprocity with this dark (and insanely attractive) version of Wei Wuxian - but a couple of rather transparent hints should be enough, right?