In another world where gender moral roles are reverse

It's been 12 years since I got transferred into this world.

My name is Jin and in my past life, I was just a regular blue collar worker and I got reincarnated into this strange world.

First of all, my family:

My oldest sister Yuri, looks and acts like a Yankee from an Anime,

my second older sister Aki is no better she's a NEET and looks like she has no interest in changing that lifestyle and

My mother Akari... there's really not much flaws; She's an owner of a small and thriving company but leaves the management to someone else, so she's home almost everyday, I guess her weird quirk is she's really passionate about Mens Volleyball but other than that not much...

She's beautiful too, actually ALL of us can be considered beautiful in my previous world,Yuri has short blonde hair, flawless and tanned skin and fit physique,

Aki is no different; silky long black hair, glimmering white skin with a plump hour glass figure,

Mom is a brunette with a skin flawless for her age, a voluptous and fit figure; She's gorgeous... (I wonder why my dad left her?)

And ME, just imagine the popular handsome kid at school but more cuter, looks like an actor and really handso--

Mom: Jin!! Breakfast~

Jin: Okay!!

I discontinue what I'm doing and headed downstairs

Mom: "After you're done. Give this to your sisters. Mom is heading to work for a lil bit, for a meeting so be a good Boy today okay?"

I nodded in agreement

After I was done eating I headed upstairs and held 2 food trays for my sisters. As I was at the hall I noticed flashing lights under Aki's Door.

Jin: Aki-nee!! Here's your food!

The light on the floor stopped and a rustling of sheets

can be heard.

Jin: no response huh?... It looks like she still want to be left alone.

I put her food in the floor and tried to open her door.

It was locked so I just left her food by her door and immediately headed to Yuri's room.

She's the type to not locked her room so I should just leave the food there if she's still asleep.

I Knocked on the door

Jin: Yuri-nee!! Im coming in!

No response... Looks like she's still asleep.

As soon as I entered the room I was immediately presented with Yuri's half naked body.

Her pink nipples sheening and reflect the early sunlight, My body immediately reacted and all my blood went straight to my nether regions.

I stared at her body for approximately 2.5 seconds before realizing how wrong it is to have a boner at your sisters tits. So I immediately tried to calmed myself down and put the food on her table.

Until I notice something under her bed.

Jin: this is...