The Visit

Set two months after the death of his squad, Levi begins to accept everything, including Petra's. Unfortunately, that is the period of time when Petra's ghost comes to visit. Will Levi be able to see her once again? And will she be able to say her goodbye properly? With a help of a certain person, they might. (Levi/Petra ship [BEST OTP EVER!] and an existence of an OC)