Niece 5 Pantsu and pantsu.

ーーThe next morning, I wasn’t able to sleep at all after that. Since everyone was about to wake up, I also went down from the loft. Naturally, my physical condition was at its worst because of the lack of sleep.
「Oji-san, ohayo! Nee nee, let’s go to eat breakfast at a store!」
It was Asari-chan who jumps energetically from her waking up. It was a very innocent, child-like action devoid of any wicked thought or wariness toward me. If Nana-chan was also like this then it would be manageable.
「U〜n, Asari-chan, sorry. Oji-san is poor so I don’t have money to eat outside」
「Ee〜, is that so? But……hora, if it’s money then I have!」
Asari-chan took out several ten yen coins from her pocket and handed it to me. Because of the excessive cuteness, I unintentionally pats her head strongly.
「Thanks, Asari-chan. But, keep it for the next time we go to the shop, okay? Today, Oji-san will prepare somethingーー」
At that time, Akira who felt despondent from her waking up also went down from the loft. And, she approached me, pulled the hem of my shirt and urged me to go to the bathroom.
「Akira-chan, what happened?」
「A, ano…..I……wet my bed……」
She is depressed to the point that it’s painful to look at and sniffs. Yesterday, she was also the one showing off her onee-chan style by dealing with my leaking incident, that shock was considerable. (昨日、俺のお漏らし疑惑を処理するお姉ちゃんぶりを見せつけた矢先ということもあり、そのショックは相当なものなのだろう。)
ーーBut, Akira-chan. It’s not your bed-wetting, it the crystallization of my perverted desire……Sorry, really sorry!!!
I was also driven by a strong feeling of guilt, but I couldn’t say the truth……I can only cheer Akira-chan up kindly.
「It’s all right. I absolutely won’t tell anyone, it was just the nervousness from staying at a new place for the first time. Quickly change your clothes, okay? I will wash them immediately」
「u……un……gusu……Onii-chan, sorry」 (sfx: sobbing)
Akira-chan apologizes with her reddened eyes and takes off her pajama, pants and pantsu without hesitation before my eyes. The pure, beautiful vertical line without any impurity directly was plunged into my eyes!
I couldn’t look away. I’m suppressing my wicked feeling towards my blood-related niece! But if it’s this early in the morning, this explosive s.e.xual desire is hard to control.
When she turned to the back, her cute, 100% softness b.u.t.tocks pushed out to me, she put on the spare pantsu she held and went to the living room.
「Washing……There is no other things to wash, and there is also problem with the washing machine’s rotation with only a piece of pantsu」
Actually……. Holding in my hand the pantsu which was amazingly rolled into a small ball and had some character printed on, my abnormal desire once again increased rapidly.
I can easily hear my cute nieces exchanging various conversations in the nearby living room, which is separated by one thin door. In this situation, what the heck am I going to do!?
But, almost unconsciously, I exposed my thing and covered it with the pantsu, then began to rub my semi erected thing.

*Gacha*!

I reacted quickly upon seeing the slowly but surely opened door and reflexively turned my back on completely and covered my thing. But there’s not enough time for that. When I look back timidlyーー
「O, onii-chan!?」
It’s Makoto-chan! She didn’t properly know what happened, but she seemed to know that I was taking some strange action. It becomes hard because of the bew
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ildered feeling of whether or not she would touch that matter. (no subject here so not sure if “she would touch the matter” or mc himself would do that) 
「Makoto-chan, e, etto, this is……」
「……I intend to search for something to make a side dish for our breakfast in the refrigerator…….but sorry, onii-chan. I, understand. That……you are about to do e, ecchi thing and……you have such a feeling to Nana-chan, right? S, so, I also, understand a little……」 (え、えっちなことしようとしてたっていうのは‥‥奈々ちゃんってあんな感じでしょ？)
Aaaaaaa!!! What am I dong this early in the morning!? And also being taken into consideration by such a small girl. To me who doesn’t say other words, Makoto-chan turned around before my eyes while feeling embarra.s.sed, out of all things, she puts her hands to the pantsu on my thing.
「This, this is probably, Akira-chan’s pantsu, right? Since it will be bad if it get more dirty……that, can you change it with mine?」
Makoto-chan takes off the curled pantsu, she then changes into Akira-chan’s pantsu while turning her face away. (真琴ちゃんはクルリと丸めたパンツを脱ぐと、顔を背けたまま晶ちゃんのパンツとチェンジしようとする) Makoto-chan who has lots of worldly knowledge (aka knowledge about s.e.x) also doesn’t have the courage to look at my thing, as expected.
「e!? S, such a thing….. I don’t intend to do that, I’m not doing ecchi thinーー」
I tried to gloss over it, but Makoto-chan found out.
「Onii-chan, I won’t told Akira-chan, of course I won’t told Nana-chan too, so please be relieved. I’m the onee-chan so I understand Nana-chan well. Or, is my pantsu……not good?」
「N, no, it’s not! Ratherーー」

*Pinpon*!

This early in the morning, probably not Reika-san’s interphone, so who’s it?
I thought that it was exactly the right chance to interrupt the talk, but that was the sound of a bigger nightmare and the beginning of chaos.

*Dondon*!!!

「Hey nii-chan! Please open quickly! Your newly-wed wife Momoko has come to help!!!」