【Apatite】Isn’t it perverted to lust after your sister? ～The Black Gal’s Little Sister Playing with Her Big Brother

Story
One day on a crowded train, I was baffled by the sexy girl in front of me, but my crotch reacted.

[Oh, hey brother!]

Her name is Futaba Kou. She’s my sister.

He stared at me with sharp eyes, but this reaction was not intended in any way.

“Well, seriously ……! …… Hmmm, this is good. I’ve got a good idea.

Then, all of a sudden, he started taking out my stuff!

[Oh, here, here, here train–!]

Hey. Do you want to pull it out? Would you like to have your cute little sister suck your dick for you?

I’m sure you’ll be happy to hear that.

Characters
Futaba Kou (CV: Akari Hazuki)
The younger sister of the sun.
She is cheerful, uninhibited, and loves sex.
She has a lot of energy, but she doesn’t think too far ahead.

Futaba Sun
The main character.
Older brother of Akira.
He has a dull appearance and is reserved; age = virginity.
I’ve never had any experience with it, so I’m not aware of it.