Here is the template I'll be using for SFW alphabets:
A = Affection (How affectionate are they? How do they show affection?)
B = Best Friend (What would they be like as a best friend? How would the friendship start?)
C = Comfort (How do they comfort you? Are they good at it or are they kinda awkward? How do they like to be comforted?)
D = Domestic (Do they want to settle down? How are they at cooking and cleaning?)
E = Ending (If they had to break up with you, how would they do it?)
F = Fiance(e) (How do they feel about commitment? How quick would they want to get married?)
G = Gentle (How tender are they, both physically and emotionally?)
H = Hugs n' Cuddles (Do they like hugs/cuddles? What are they like? How often do they happen?)
I = I Love You (How quickly do they tell you they love you?)
J = Jealousy (How jealous do they get? What do they do when they're jealous?)
K = Kisses (What are their kisses like? Where do they like to kiss you? Where do they like to be kissed?)
L = Little Ones (How are they around children and what are their thoughts on them?)
M = Morning (How are mornings spent with them?)
N = Night (How are nights spent with them?)
O = Open (At what point would they start revealing things about themselves? Do they say everything all at once or take their time with it?)
P = Patience (How patient are they?)
Q = Quizzes (How much do they remember about you? Do they remember every detail or kinda forget everything?)
R = Remember (What is one of the most important moments of your relationship?)
S = Security (How protective are they and how would they protect you? How would they like to be protected?)
T = Try (How much effort would they put into dates, anniversaries, gifts, etc?)
U = Ugly (What are some bad habits of theirs?)
V = Values (What do they value in a partner?)
W = Wedding (How are they on the big day? How do they help plan it out? Are they emotional or stoic?)
X = Xtra (A random headcanon for them)
Y = Yuck (What are some things they can't stand, both in a partner and in general?)
Z = Zzz (What are some sleep habits of theirs?)