Harry Potter:

Ron/Pansy

OTP Harry/Ginny

OTP Ginny/Blaise

OTP Draco/Hermione

OTP Sirius/Lupin

James/Lily

James/ Regulus

Astoria/Blaise

Pansy/Blaise

Lupin/Tonks

Dean/Seamus

Throne of Glass:

OTP Celaena/ Sam

Celaena/Chaol

Celaena/ Dorian

OTP Celaena/ Rowan

Chaol/Dorian

OTP Aedion/Lysandra

OTP Elide/Lorcan

Dorian/Sorscha

Dorian/Manon

Chaol/ Nesryn

OTP Chaol/ Yrene

Fenrys/Gavriel

A Court of Thorns and Roses:

Tamlin/Feyre (Only in book 1)

Eona:

OTP Eona/Kygo

Eona/Ido

Girl of Fire and Thornes:

Elisa/ Humberto

OTP Elisa/ Hector

Percy Jackson/ Heroes of Olympus/ Gods of Asgard/ Trials of Apollo/ Kane Chronicles:

Percy/ Annabeth

OTP Percy/Nico

Jason/Piper

Piper/Annabeth

OTP Leo/Jason

OTP Leo/Calypso

Frank/Hazel

OTP Annabeth/Reyna

Thalia/Luke

Rachel/Octavian

Will/Nico

Travis/Katie

OTP Grover/Juniper

OTP Charles/Selena

OTP Thalia/ Bianca

Luke/ Annabeth

Thalia/ Annabeth

Tyson/ Ella

Coach Hedge/ Mellie

Piper/Reyna

OTP Sadie/ Anubis (and Walt combined)

Sadie/ Walt

Sadie/ Anubis

OTP Carter/ Zia

Magnus Chase/ Alex

Divergent:

OTP Tris/ Four

Christina/ Peter

The Hunger Games:

Peeta/Katniss

Gale/ Katniss