Your search for "Levi Ackerman x Petra Ral" revealed the following:
Danganronpa Doujinshi - Love Gotcha (Shuichi Saihara x Kaede Akamatsu)
$ 40.95Product details: Shuichi Saihara x Kaede AkamatsuWhat happens in the love apartment, stays in the love apartment in this super...
One Piece Doujinshi - Shed Crocodiles Tears 1 (Crocodile x Luffy)
$ 40.95Product details: Crocodile x LuffyCrocodile gives Luffy a job - just what does Luffy do for the Croc? Will this...