And while we were enjoying the pool.

"Alright big bro! Now go have fun with Reo just the two of you! I’ll take care of Umi!"

Mitsuki pushes both me and Takatsuka-san forward.

"Just the two of us?"

"Come on, your precious little sister is being considerate. Let’s accept her kindness."

Takatsuka-san clings to my arm, locking me in place so I can’t escape.

There’s no doubt some kind of agreement was made between Takatsuka-san and Mitsuki.

"There’s a waterslide over there. It’s the main attraction of this place. You’ll miss out if you don’t try it. Let’s go together."

Mitsuki standing next to Takatsuka-san grinning tells me to lend her my ear.

"I want Reo to become my big sister. So do your best okay."

W-wait does that mean she wants us to date with marriage in mind?

When I glance at Takatsuka-san she’s smiling meaningfully.

That face... this was definitely her idea...

"Come on, I'm going out of my way for you here."

Mitsuki literally pushes my back.

Having my sister taken over like this I have no choice but to head to the waterslide with Takatsuka-san.

Since it’s a popular attraction there’s quite a line but while I’m busy protesting how she used Mitsuki and at the same time thanking her for taking care of them our turn comes up.

"There’s something common with waterslides."

Takatsuka-san places her foot on the step and speaks.

"You slide down on your back right? Apparently it’s pretty common for swimsuits to come off from the force."

"I don’t think it happens that often..."

Maybe it happens in fiction but I’ve never seen it in real life.

"I don’t feel like showing my body to anyone other than you."

"You’re already wearing a swimsuit though?"

If anything I’m the one more covered since I’m wearing a rash guard.

"Sure it’s a bikini but look here."

Takatsuka-san points at her waist.

The sides are tied with strings.

It might just be the design but it looks like it could come undone if pulled...

"Think of it as protecting me. When we slide, let me hug you."

"Huh?"

"If I use you to block the water my swimsuit will stay intact right?"

Wait a second.

That means she’ll be hugging me from behind while we slide right?

That’s embarrassing...

It’s basically like a real couple...

But Takatsuka-san taught Mitsuki how to swim and gave my sisters a fun day.

"...Fine. But don’t do anything weird, okay?"

"What do you mean by weird?"

"Weird is weird! You know what I mean!"

"Then explain it since I don’t understand."

While trying to shake off Takatsuka-san who won’t let go, our turn arrives.

"Come on, sit in front."

Not wanting to cause trouble for the staff or people behind us I reluctantly do as she says.

"Ah..."

"You’re still so thin."

Takatsuka-san hugs me tightly from behind.

It feels like my body is being swallowed by hers.

"We’re a newly dating couple."

Takatsuka-san casually tells a lie to the staff.

There was no need to say that and it’s not even true...

"Hayama-kun let’s do our first joint activity together."

"Don’t say things that sound misleading!?"

"Alright let’s go. We’re holding up the line otherwise."

She makes it sound like it’s my fault...

And then we slide down.

Behind me I feel Takatsuka-san’s extremely soft body and from the front the pressure of the water creating a strange sensation of being sandwiched between soft and hard.

We exit the slide, experience a brief floating sensation then splash into the water sending up a huge spray.

"Th-that was pretty intense."

The speed feels addictive in a way you wouldn’t expect just watching.

"Takatsuka-san are you okay?"

"...This might be bad."

Takatsuka-san lifts only her face above the water.

"My bikini top flew off somewhere."

"What!?"

I frantically look around for the white top she was wearing.

"It should be around here, help me look."

"O-okay."

"While we look, cover my chest with your hands."

"Okay! ...Wait, no I'm not doing that!"

I almost reach toward her chest before quickly raising my hands into the air.

"Hmm, I thought you’d touch me. That’s disappointing."

Takatsuka-san rises out of the water.

Her chest is still properly covered by the white bikini top.

"It didn’t come off..."

"Relieved? There’s no beautiful girl who lost her top here."

"I’m not falling for your lies anymore!"

"Don’t say that. Oh wait. Your chest is slightly exposed instead."

"Ah you’re right!"

Maybe the zipper came down from the force of the water.

"It was fun but we should be careful with the water pressure."

"Yeah seriously."

Takatsuka-san climbs out of the pool.

Seeing her wet body glistening I quickly look away.

"But something good did happen."

"What?"

"I got to see your nipple. A nice pink color. Thanks for the treat."

Covering her mouth and whispering, Takatsuka-san is clearly enjoying herself.

The thing I need to be careful about isn’t the water pressure.

It’s Takatsuka-san herself.