Wesper

Wesper is the ship between Wylan and Jesper from the Six of Crows Duology.

Six of Crows
Wylan and Jesper do not have a big relationship in the first book, but Jesper loves teasing and flirting with Wylan, and Wylan blushes every time he does so.

Crooked Kingdom
Jesper and Wylan liked each other from the start, and Jesper stated that he had wanted to kiss Wylan since he had seen him in "that gruesome tannery". At some point, after Jesper gets in a big fight with his father, and since Wylan got tailored by Nina to look like Kuwei, Jesper accidentally kisses Kuwei. Wylan walks in on them kissing, and is obviously hurt, but says nothing. Near the end, they do kiss, and it is wonderful.

Fanon
Wesper is the pairing of Wylan and Jesper. Wylan is gay, and Jesper is pansexual, and they find them deep in love. Personally, they are my favorite ship in the Six of Crows Duology.