Gotta say at first i was skeptical about Sugarcoat being the "Horny girl" I just cant picture her being like this. She's more of a calm and collected type of person from what we've seen so far in the specials.
But hey, that doesnt mean its not enjoyable seeing her be in all these wild situations.

9104576
To be fair, there hasn't been a lot of character development for Sugarcoat. All that's really known about her is what you just said, so I like to think there's room for this as a possibility. Besides, it wouldn't be all that surprising if there's a bunch of fics here about the calm and collected ones being sluts. You know the saying: "It's always the ones you least suspect."

9102709
She is.