Because they are around the same age
They are both royalty (AU)
Both struggle with parents
Want to have fun
Feel isolated
Want to make others proud
He can make her laugh
She can make him blush
She can see the good in him
She can introduce him to loving friends
He can carry her away
He can learn the importance of mercy
He can learn that strength comes from within
Kind of Romeo and Juliet like
Possible to join kingdoms
She isn't afraid of the dark
She can introduce him to the light
He would gain confidence
There are worse pairings out there
A crossover pairing from games made by the same creator
All the card pick up lines
She calling him an ace
He tries to flirt back
She laughs at how cute he tries
He trying to impress her
He messed up but getting back up as if nothing wrong happened
Jealous Monster Kid
She would spare his dad
She wouldn't give up on his dad
He would learn to stand up
Kris being supportive towards his sister
He is a boy of the spades
She has a heart the size of the skies
Unaware of royal status
He unsure how to flirt back
He asking lesser dad how to flirt
She pretends to act all surprised to make him happy
She refusing to fight his father
She begging Sans to not kill the spade king
He defending his new friends from his father
Taking a hit to keep them safe
He finally said a pickup line when he is hurt and she has him in her arms
She giggling in response
He trying her friend's pies and spaghetti
He learning puns with Sans
He and Susie being extreme with Undyne
The reveal that they are both royalty
She and him dancing to Mettaton's music
He seeing the sun rise and set for the first time
Them learning about each other's kingdom
They remind me of Steven and Connie (from Steven Universe) in someways
Playfully sticking their tongues out
He being fed
Breaking rules to see each other
Playing games in the sun
Playing games in the dark
Young (no sexual) romance is the best
Pure fluff
Getting him a disguise so that no one recognizes him
He is viewed as an enemy when revealed to be the son of Spade king
He talking to Flowey
He finding out how she set the monsters free