Why have imoutos become more and more bold with their predation of onii-sans?

Why have imoutos become more and more bold with their predation of onii-sans?

Attached: 1557490456089.webm (854x480, 2.41M)

because onii-chan is too dense.

They have to defend their purity with their density from sexually starved imoutos though.

This onii-chan... is already ded!

Attached: nil-ta-n-akari-nll-tan-anime-irl-37435226 imouto headbutt.png (500x1555, 660K)

is it NBR trash?

It's a natural evolution

>Ikoma
>Mumei's onii-chan
NO

Attached: 1462578201995.jpg (384x384, 19K)

S2 when?

I didn't think they would push this.

Attached: 1461907793116.jpg (700x583, 153K)

Yes, she is plot subsidized substitute imouto for onii-chans who have lost their imoutos to kabane