I'm Back- Who Da Faq is This Snake-B***h? (Male OC X Dropkick on My Devil)

(ALL ART, CHARACTERS, VIDEOS, ETC. BELONG TO THEIR RESPECTIVE OWNERS!!! DON'T SUE ME!!!)

Among the Hanazono family, two step-children were born and recorded as the most formidable upon birth.
Yurine, the younger sister, attained instant mastery of every close-combat weapon and the luck to obtain these weapons with top-of-the-line quality.
And you, Kujou Hanazono, the older step-brother, attained a connection with darkness itself along with CQC mastery.
Oh, and you both have superhuman strength for some twisted reason. Even God knows not why.

Years have passed since your births and you two had lots of fun together, traveling the world (with your shadows) and uncovering lost and legendary weapons of the world, much to Yurine's delight. While getting an education, of course.
What's more, you two quickly grew close together over time as she is always happy when she's around you and you are also happy when she's happy.

Sadly, you both had to separate due to both of your parents not tolerating you both without any higher education.
So, Yurine went to college to further her studies and she even landed herself a decent part-time job.
You, on the other hand, forsook the academic path your parents wanted you to embark on. So you joined the Japanese military and quickly shot up the ranks and racked up a large number of achievements and awards. Though, most had to be covered up due to your powers and other "influences".

After raking in tons of wealth and influence by straight-up killing people for the military, you eventually retired before returning back to civilization.
From there, you would look to reunite with Yurine to catch up and continue spending time with her. But...

Kujou: Yurine-chan...
Yurine: Hai (Yes), Onii-sama?
Kujou: Who da faq is this snake-b***h?
Jashin-chan: Ooh, I'll show you a b***h! JASHIN-CHAN DROPKICK!!!!!