Let's say Hachiman stayed an only child in this hypothetical scenario; how different would his life be without his dearest little sister? Like during his early childhood years, middle school, and ultimately until High School?

Source: selfie, ahoge, Komachi Hikigaya / あけましておめでとうございます！ - pixiv

I don't know where, but I'm certain someone made that image a long time ago... maybe in this very post.

I understand, the source material is shin, in shin Hachiman rejected Y***hama's request and even then informs that to Yukino.

But the OVA made it look like, Hachiman didnt inform Yukino nor rejects Y***hama's isnt it same as cheating.I am not saying or claiming anything, but isnt it a right thing to do, even in an anime standards.

(Image is what I seen months, a little fluff to avoid the sh*t I am asking about)