Hands

Between Twilight and Discord, draconequus is often the one who acts all flirty and is dominant. But sometimes Twilight takes a hold and dominates her dork noodle husbando. You can rarely see Discord embarassed, so it's a double pleasure for her to see him like this. Twilight likes to play some sort of gentleman and she likes Discord's hands (she has her own reasons  ). Discord doesn't really mind...

Headcanon: Don't kill me for this, but I see Twilight as a xenophile. It makes sence to me because she's a scientist and she's into anything new and enigmatic. In her case she's into some other species. She quickly develops a crush on Flash even though he's a human, so...