Isolation

Post HBP. Ron and Harry are Horcrux hunting and Hermione has been left at Hogwarts to help the Order make it safe for the other students. Draco is forced by Snape to stay in Hogwarts for his own protection, but he can't leave the room he is given; Granger's room. Hermione is the only student trusted with this informat...

Helium ( DNF )

Go read the original one by tbhyourelame on ao3 (you can only read it if you have an ao3 account though which might take a few days )