A = Aftercare (What they're like after sex)
It is just cuddles and naps, maybe even some snacks.
B = Body part (Their favourite body part of theirs and also their partner's)
Nightmare enjoys their waist and neck.
His tentacles, he can use them for just about anything they're very helpful. Especially during intimacy.
C = Cum (Anything to do with cum basically... I'm a disgusting person)
It is a blueish black in color, the feel of it is a slimy and slippery texture to it(easier for him to go faster) he doesn't taste like much, maybe an after taste of sour grapes.
D = Dirty Secret (Pretty self explanatory, a dirty secret of theirs)
Sometimes he would want to have sex after a good mission went in his favor.
E = Experience (How experienced are they? Do they know what they're doing?)
To be honest here, he and his gang would be intimate together from time to time.
F = Favourite Position (This goes without saying. Will probably include a visual)
He wants to see his lover's face, so any position that lets him see his lover’s face. He would also want to have them close to his body.
G = Goofy (Are they more serious in the moment, or are they humorous, etc.)
Very serious, for him to want to have sex with anyone there needs to be a lot of trust and affection for him to consider it.
H = Hair (How well groomed are they, does the carpet match the drapes, etc.)
His form is covered in tar like goop.
He keeps himself as clean as possible for his form.
I = Intimacy (How are they during the moment, romantic aspect...)
He cares for the one he has sex with, though he adores his lover. So he is considerate to both a partner or lover.
J = Jack Off (Masturbation headcanon)
Uh huh but most often he doesn't finish alone. It ends in sex or love making sometimes.
K = Kink (One or more of their kinks)
Having his tentacles grip onto his partners or his lovers legs wide for him.
Sensation kink either using it on his partner or lover, or against himself.
Technically bondage kink too since he would want to use his tentacles to hold his partner or lover with them.
L = Location (Favourite places to do the do)
Anywhere in the castle, there is no shame or embarrassment between him and his gang.
M = Motivation (What turns them on, gets them going)
Asking him for intimacy is motivating.
His partner or lover wearing something fancy, mot too fancy or fancy weird. Also having his symbol either on them or their clothes is a good turn on.
Showing they’re interested catches his attention.
N = NO (Something they wouldn't do, turn offs)
Being forceful is a h u g e n o . he cares for his partners and lover (s)
He doesn't mind cum but any other fluid is a no.
O = Oral (Preference in giving or receiving, skill, etc.)
He isn't too into it but might give it to his partner or lover sometimes, not often he does though.
P = Pace (Are they fast and rough? Slow and sensual? etc.)
His pace is fast and deep. Pulling out then thrusting in fast and as deep as possible, he may be a tad rough but nothing painful.
Also fast and gentle, his pace is always fast but he also likes being extra gentle most often.
Q = Quickie (Their opinions on quickies rather than proper sex, how often, etc.)
There is no such thing as a quickie with this being. He loves taking his time with his partners and or lovers.
R = Risk (Are they game to experiment, do they take risks, etc.)
He and his gang have no modesty within the castle, but they would rather not be caught in such a position by any of their enemies.
S = Stamina (How many rounds can they go for, how long do they last...)
He can go for quite a while, but no one really knows his limits.
T = Toy (Do they own toys? Do they use them? On a partner or themselves?)
Only if his partner or lover would like to use them. Other than that he has none of his own.
U = Unfair (how much they like to tease)
Depends on his partner or lover.
V = Volume (How loud they are, what sounds they make)
He doesn't hide anything, he would grunt or moan out. He would also praise who ever he is being intimate with.
W = Wild Card (Get a random headcanon for the character of your choice)
Nightmare and his gang are like an odd family, they care about each other and don't mind being intimate with each other.
X = X-Ray (Let's see what's going on in those pants, picture or words)
Blackish blue in color, also drips like any other of his body part too.
His length is at 6'9 inches and his girth is somewhat thin and has a curve to it. He has a knot that ties him and his partner and lover together for sometime.
Y = Yearning (How high is their sex drive?)
It is super high up but he is careful on where they are or who he is with.
Z = ZZZ (... how quickly they fall asleep afterwards)
He would probably do something to pass time or just cuddle with whoever he was with.