Killer X Cross X Nightmare, I think.

Whenever I think of Nightmare being in any kind of relationship, I imagine it would end up being very abusive, just due to his overall personality and nature.

So, lets skip by that and go to the fun scenario for if they did happen to have a good relationship.

I imagine Killer would be a massive tease. He'd be the one causing the most trouble and the one trying to get into the other two's pants.I also think he'd be the kinkiest one.

Cross would be the supportive figure, I reckon. He'll be there to support his two lovers and may get them both to try and talk about their past trauma so they can move past it. Whether or not that works, I haven't a clue.

Nightmare would probably act all grouchy and agitated most of the time. A man who can only be softened by two wonderful dorks. He would likely be in denial whenever anyone asked about his relationship, even if they literally caught him cuddling.

Also, cuddly Nightmare. That is just so good, I cannot express my love enough for cuddly Nightmare.

While I think it wouldn't be a healthy relationship in reality, the scenarios of them actually being healthy are fun and often hilarious. Don't be surprised if you catch me reading a book with this particular ship in it. X3

6/10.