While the writing quality of your story is good, please note this part of the Content Guidelines:

"Please note FanFiction does not accept explicit content, Fiction Rating: MA, and the rating is only presented for reference."

Please remove all of the detailed descriptions of physical interaction of sexual or violent nature in the story if you want it to remain at this site, or upload it to a site where "Fiction MA" content is permitted such as AdultFanfiction.

You did great on this!
I just had to do this mini paragraph below XD:

~~~~~1 Week Later~~~~~

(Y/ N): Seijuro, you Baka! *pinches his cheeks*
Akashi: Whawt dif I du?! (What did I do?!)
(Y/ N): This is why the people made Condoms! *blushes as she releases his cheeks*
Akashi: *blinks several times million times* Eh?
(Y/ N): I'm pregnant! *blushes harder*
Akashi: *blinks several million more times*...I really do succeed in everything I do don't I? *slap*

WHOH
WHOH
WHOH
HOT HOT HOT HOT-
I love how you make Akashi-sama be 'gentle' to me huehue
*literally-slapped myself from grinning creepily

I'm glad there aren't any of those anal rule enforcers who noticed this fic (really, they'll make u change the whole story because it is reader interactive type, if ever) cuz that ruins the fun, thanks for this awesome fic ;)

This was so good! I really like how there was a nice back story and the lemon part was simply perfection.

this is so kawaiiiiiiii 3
nyaaaaaaa

Awwwe i loved that it was soooo kawaii!

omg... Akashi is so sweet O i want sequel!

The kiss marks part, ughhhhhhhhhh 3

That was nice. Keep up.
lol the scores part. I don't think I've ever gotten a 97 in Math. My scores are usually higher.
This is a fanfic anyway.

wow...make another!

Really good!
You are a great&awesome!

oh my god sei-kun you're so sweet
then just make another Chara x Readers (LEMON) okay i'm a pervert! but i love youf lemon fic!
i will wait your next fic :3
btw , why you not make Hanamiya x Readers? or HimuroxReaders? XD
Hanamiya is a bast*rd , but many fangirls love him !
Himuro is famous :3
well... that's just my reccomendation , but i hope someday you will make my reccomendation fic XD

Awwwhh :3
Sooooo cute!
If I had to give you an advice then maybe use (y/n) instead of _
It'll be more clear where to put one's name...
;)