Dating Deceit would include:
(~Means him, -means you, +means another side)

*Him comforting you when you have a panic attack.

*Always stopping him from doing his evil plans.

~"What if I 'don't' disgu-"
-"No..."
~"What if I just-"
-"No..."
~"Ugh! Fine!"

*Breaking up his and Virgil's fights.

+"God you're so annoying!"
~"You 'aren't' more annoying!"
-*Pouting* "C-can you two stop fighting?"
+/~*Looks at you and quickly start apologizing to you to stop you from almost crying.*

*You being the first one to know about his symbol (The one with the cute two headed snake with its tongues out)

*Him scaring you playfully then regretting it and apologizing.

~*Jumps out from corner.*"Boo!" *Laughing*
-*Squeal then you dropping to the floor, hugging yourself*
~*Almost immediately regretting it.* "Ack! I'm 'not' sorry hun! Oh no! Don't cry!"

*Begging him to let you touch his scales.

~"No, you may!"
-*Puppy dog eyes* "Please...!~"
~*Blush and groan.* "Fine hun!" *Yay from you*

*Him flirting with you when he's jealous of the others