Your search for "Levi Ackerman x Petra Ral" revealed the following:
Hetalia Axis Powers BL Doujinshi - Like the Dance of Falling Cherry Blossoms (USA x UK / Alfred x Arthur)
$ 33.95Product details: USA x UK / Alfred x ArthurTalk about a battle of wills~ Will UK finally admit his feelings...
Megaman YAOI Doujinshi - Enzan and Netto's White Day (Eugene Chaud x Lan Hikari / Enzan x Netto)
$ 53.95Product details: Eugene Chaud x Lan Hikari / Enzan x NettoWhoa! We know how these two bonk-buddies celebrate White Day...
Betterman HENTAI Doujinshi - Ten (Hinoki Sai Lina Inverse and Asuka)
$ 26.95Product details: Hinoki Sai, Lina Inverse and AsukaThe main focus is Hinoki Sai in the comic portion. There are shorts...
Glitter Force Doujinshi - Ultra Happy Bad End 3 (Brute x Ulric / Akaoni x Wolfrun)
$ 26.95Product details: Brute x Ulric / Akaoni x WolfrunBrute has his way with Ulric in this steamy comic!Item Title: Ultra...
Blue Exorcist YAOI Femtrans Doujinshi - blue exorcist topaz (Yukio x Rin Renzo x Rin / Renzo Shima x Rin Okumura)
$ 67.95Product details: Yukio x Rin, Renzo x Rin / Renzo Shima x Rin OkumuraThis is a sexy remix of some...
Persona 5 Doujinshi - Heart Conduction Cross (Goro Akechi x Ren Amamiya / Akechi x JOKER / Akechi x JOKER / Akechi x Hero)
$ 201.95Product details: Goro Akechi x Ren Amamiya / Akechi x JOKER / Akechi x JOKER / Akechi x HeroThe artwork...
Hetalia Axis Powers YAOI Doujinshi - This is the only way I know how to love (Prussia x Germany / Gilbert x Ludwig)
$ 33.95Product details: Prussia x Germany / Gilbert x LudwigPrussia is a vampire - and Germany is dying! Will Prussia be...
Blazblue HENTAI Doujinshi - Alucard Lunatics (Ragna x Rachel / Ragna x Rachel Alucard Noel x Self / Noel Vermillion)
$ 26.95Product details: Ragna x Rachel / Ragna x Rachel Alucard, Noel x Self / Noel VermillionRachel has a bangin good...
Castlevania YAOI Doujinshi - Eclipse (Issac x Trevor Belmont / Issac x Ralph Belmont / Issac x Trevor / Issac x Ralph)
$ 53.95Product details: Issac x Trevor Belmont / Issac x Ralph Belmont / Issac x Trevor / Issac x RalphTrevor gets...
Attack on Titan YAOI Doujinshi - What'll Happen If I Get the Captain Drunk? (Erwin x Levi)
$ 26.95Product details: Erwin x LeviHow will a drunken Levi respond to Erwin's advances? Sexily, of course~ >_^Item Title: What'll Happen...