Senchi Kara Kaette kita Takashi-kun. Futsuu ni Koukou Seikatsu wo Okuritai - Vol. 1 Ch. 2

[bababoy556]

Panel 1: Okay a sisterly kiss. She really missed her little brother.

Panel 2: Wait a minute why are you liking him?!

Panel 3: And now biting!! Sweet Home Alabama...

Sweet home Alabama? nah this is sweet home YOSUGA NO SORA

 

[oktimeout]

was that really necessary

 

[MiguelH224]

You make it sound like incest stuff isn't popular world wide, its consistently the in the top 10 of PH searches

Damn, all of that mental illness just floating around

 

[angelodrip]

Hell nah why is there incest slop bruh

 

[CrimsonSix]

What kind of sister is this...?

 

[caliche9700]

Hahaha the big sister was practically eating the boy

 

[colorlesseatstomboys]

You aren't wrong that it's gotten kinda weird how common 2D incest is.

Oh boy, It was 200% more common before the digital age. And most of it wasn't bait to fill up the MC's harem either. They went way further and committed to it.
And back then, most mangas had a different art style, more raw, and sensual I'd say so the feels hit different too.
Now, it's almost always just pseudo incest, basically mangakas just following the trendy trope of adding a brocon imouto.