Why doesn't Yui have sex with his demon to power up?
>Finally knowing enough hiragana to be able to type that up into google translate
inb4 >google translate
>male shinoa goes around smuggin' on all the cute grills
You can do it, anon.
Reader's imagination... #2
If the characters were of different genders
Owari no Seraph x Genderbend?!
Reader's imagination... #3
If Yuu-chan, Mika and the others were idols
Owari no Seraph x Idols
Notice how 仮想 can be read as "imagination" or "what if" in this case.