I am currently half-naked and being pushed down by Amy and Mia on the beach.

-Mia, Amy, can we talk a little about this? (Farah)

-Sister, you can keep lying down. (Amy)

-Right, sister... (Mia)

Amy and Mia's eyes become so scary. I don't think I can reason with them now. The moment I try to escape from their binding, Amy instantly use gravity magic to hold me down.

-Amy! (Farah)

-Sister, can you be a good girl and keep lying down?

To understand why is this happening, let's look at how did this happen.
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Five hours before the event on the beach happened.

-Humm~Humm. (Farah)

I am cooking breakfast for the twins and me. Suddenly, Mia and Amy appear right behind me.

-What's the problem, you two? (Farah)

The two seem to be hesitated and keep looking at each other. After a while, they nod at each other and turn to me.

-Sister! (Amy)

-Yes? (Farah)

-You tell me you would fulfil one wish if I successfully activate the magic, right? (Amy)

I remember I have made a promise like that to Amy.

-Well, right? (Farah)

-Can you go to the beach and swimming with us? (Amy)

-Eh! (Farah)

Amy looks at me with a teary face.

-You will fulfil your promise, right? (Amy)

Under the pressure of the twins, I can only accept their offer.

-Let's go to the beach after finishing our breakfast. (Farah)

-Hooray, Sister. (Amy)

-I love you, sister! (Mia)

-Moh... (Farah)

Before I come back to the room to change clothes, Mia gives me a packet of clothes and reminds me I have to wear them before I go to the beach.

-What is it, Mia? (Farah)

I try to open the pack and check what is inside. Mia grasps my hand and stops me from doing that.

-You can't open it now, sister. (Mia)

-Eh? (Farah)

-You can only open it when you come back to your room, sister. (Mia)

Mia looks at me with a serious face.

-You must wear it. Otherwise, I will be sad, sister. (Mia)

I pat her head and answer.

-Don't worry, I will wear what you have prepared for me. (Farah)

-Ehehe. (Mia)

Is it only me, or I just saw Mia make a wicked smile?

-All according to my plan! (Mia)

-Hmm, what's wrong, Mia? (Farah)

-Nothing, Sister~ (Mia)

I think it's likely to be my imagination.

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*At the beach.

-Sister~ (Mia)

Amy and Mia are in front of me. They are looking at me with expected eyes.

-Why are you wearing a jacket, sister? (Amy)

-I remember I have given you the swimsuit, right? (Mia)

Mia points at herself and Amy.

-We are both wearing a swimsuit, right? Then the sister must wear one too. (Mia)

Mia comes closer and tries to take off the jacket.

-Ehehe, I know you will wear it. (Mia)

The clothes that Mia provides me is a bikini. It's a sexy black bikini. When I wear this, I find out this bikini can barely conceal the important part of my body.

-Moh, why did you select this type of indecent swimsuit, Mia? (Farah)

-I think it fits you, sister. You are so cute right now~ (Mia)

My face becomes bright red due to Mia's compliment. I inspect Mia's and Amy's swimsuits. I can notice that both of them wearing a one-piece type swimsuit. Unlike my swimsuit, their swimsuit looks much simple and less exposed.

-Moh, that's cheating. (Farah)

-Let's play, sister! (Amy)

Each of the twins grasps one of my hands and pulls me to the beach. On the beach, we engage in many kinds of games. First is beach volleyball, the twins easily defeats me in this sport.

-You two are bullying me. (Farah)

-You must try harder, sister. (Amy)

-It's extremely hard to win against you two alone. (Farah)

After that, we play a watermelon splitting game. The purpose of the game is I am being blindfolded and try to hit the watermelon. I have successfully split it after three tries.

-Fufu, did you see that? (Farah)

-You are so good at this game, sister. (Mia)

-Ehehe. (Farah)

After that, Mia proposes we will have a swimming contest.

-Let's have a swimming contest, sister. (Mia)

-Uhm, okay? (Farah)

After Mia and I are ready at the starting line, Amy issues a signal for us to start the competition.

-3..2..1. Go! (Amy)

When I'm swimming, a mysterious black ball appears and tries to suck me in. I instantly realise it's a magic skill I taught Mia a day before. Moh, Mia can be mischievous sometimes. I try my best to escape the magic cast by Mia.

-Ah~ (Farah)

It's exhausted to escape from it using sheer strength.

-Finish! (Farah)

When I stand up, I can feel like something is missing. I look down and find out the top of my bikini is missing.

-Ehhhh! (Farah)

I instantly bend down and try to hide my body. I can see Amy is walking closer to me.

-Amy, Can you get me my jacket? (Farah)

However, Amy ignores me and keeps walking closer.

-Amy? (Farah)

-Sister? (Mia)

Mia pops out from the water from behind me, pulling me backward. I lose my balance and fall to the ground.

-Ehehe... (Mia)

The twins start attacking me as if they have found their prey. Mia takes action first and starts kissing me.

-Nyaa~ ❤️ (Farah)

It's a cute smooch on my lips.

-Ehehe~ (Mia)

Her face becomes bright red after kissing me.

-Your face has turned red, sister. (Amy)

Amy approaches me and starts kissing. Unlike Mia's smooch, Amy's is much more aggressive.

-Hyaaa~❤️ (Farah)

Amy even knows how to use her tongue. At this rate, I feel like I will melt at Amy's kissing.

-It's enough! (Farah)

The nanomachine comes from my body and turns into my clone. The clone immediately strikes the twins on the head and makes them faint.