Crossmare
An Undertale AU sanscest ship involving two Characters Cross and Nightmare.
The ship was created by Jokublog on tumblr and Jael Peñaloza with a potential chance of becoming canon. The ship was soon unfortunately identified as an accidental joke by one of it's creators.

The ship has it's anniversary on July 3th and is the second most popular ship with Nightmare sans.
Crossmare, Nightcross, Crightmoss.