What the heck is he holding to scare Yukari like that?

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Either rape, spanking or both.

So even Yukari gets like this on her first time...

he is undressing (that is belt)

Good plan, Yukari. Put up a facade, then hit him when he least suspects it. Smart.

Zun, That man must be ZUN!! (I think)

I don't think even ZUN has the power to control his creations any longer, especially not like that.

I don't think it's physically possible for Yukari to blush sincerely.

Also, I would think twice if I were in this situation. I would remember that Yukari has her portal-like power, and something went wrong she would just gap your willy into whichever orifice she felt like violating.

ゆかりんの純潔がパワーだぜ。