Uchi no Ichizu na Tsuma ni Kagitte ~Jitakunai Netorare o Misetsukerareru Otto~ by Appetite - Adult Sex Game

One day I was very tired and fell asleep.
I was awakened by a grumpy, strange sound.
I'm not sure, but I think I hear voices.
But I want to sleep. I'm tired, after all.
So I decided not to worry and just go to bed.
I closed my eyes again heavily and let my body fall back onto the firm surface of the bed.
I was about to let go of my consciousness when...
"Ahh.. ahh... sis..."
"I can't suck you anymore..."
It was the voice of his wife Nanao, who was supposed to sleep next to him.
And the second was the voice of Nanao's younger brother, Eisuke.
What's happening?
What are Nanao and Eisuke doing here?
Not understanding what was happening, I opened my eyes and looked in the direction where the voices were coming from.
And then I saw...