It was the next day, Sonic woke up and put his shoes and leaves his house to Tails's workshop Sonic knocked on his door

Sonic: Tails?

Tails: Oh Sonic you can come in

Sonic: *comes inside* what are you doing today?

Tails: Well I woke up kinda early and I started to upgrade the X-tornado

Sonic: Good

Tails: What about you Sonic? What are you doing today?

Sonic: Well I wanted to do a run like aways but now I am going to eat breakfast here if you don't mind

Tails: It's okay

Sonic looked at Tails's fridge and saw a chili dog ready to be eaten so he took the chili dog and eated it

Sonic: (Yummy I like the chili dog I hope Tails don't mind)

Tails: Sonic I hope you don't my chili dog that I made yesterday for my lunch

Sonic*realized something*: Ummm no I am not

Tails: Okay because if I found out that you eated it I will be very angry

Sonic: Yup *leaves the kitchen*

Later, Sonic's friends arrived to Tails's workshop

Knuckles: Hey guys

Amy: Hi Sonic

Cream: Hi Mr Tails

Tails*Blushing*: H....hi Cream

Cream: *giggles a little*

Everyone started talking about their day, what they ate this morning and what are they going to do for the day

Amy: So Sonic what are you gonna do today?

Sonic: Well like usual I am going to do a run

Amy: Oh can I come with you?

Sonic: No Amy you can't keep up my speed

Amy: Please?

Sonic: No Amy

Amy: Okay then

Sonic: Okay guys I am going

Everyone: See ya

Sonic: Goodbye *leaves*

As Sonic leaved his friends thought he will do a run but actually he is going to the mysterious lake

Sonic: Wow I never thought my friends will be so clueless

Sonic arrived to the lake and it was clear like ice

Sonic: Wow so cool now let's go

Sonic was in front of the lake and entered it but as he entered he was standing like he is in ice 

Sonic*Impressed*: Wow! I can stand on the lake like ice

As Sonic admired the lake ice he then saw a reflection of himself

Sonic: Wow I look so awesome 

Then his reflection changed into a bloodie version of him

???: Hello there

Sonic: Who are you?

???: I am you but the dark side

Sonic: No I don't want to be you

???: Well you are gonna be me forever

Sonic pan down and put his hands on front of his dark side like it's a mirror then his dark side took his hands

Sonic*scared*: What are you doing?

???: Enter in your body of course

Sonic*scared: What?

Then his dark side said one more thing before entering in his body

???: Do you want to play with me?

Sonic*starts to cry*: No please have mercy

Then his dark side entered inside Sonic's body

Sonic*in tears*: Noooooooooo

Then Sonic fell down unconcious minutes later he got up and he felt weak and depressed

Sonic*in tears*: What happened to me? (???: Well I am inside your mind)

Sonic: What the.... what are you doing in my mind? (???: I am here to do my goal)

Sonic: What is your goal? (???: Well I want a queen for my world)

Sonic: Ok then who are you? (???: Well you can call me Sonic.exe but say exe for short)

Sonic: Listen here I demand you to leave my mind right now (Exe: Ha! It's not easy as you think)

Sonic: Okay fine I can just ask my friends and Tails will find something to kick you out of my mind (Exe: Ha! Do you think that kid will believe you, also if you try to tell your friends about this they will be gone the next day)

Sonic: How? I am the one controlling this body (Exe: You see you control your body at the day and I control your body at night time)

Sonic: Okay so I have to keep your identity a secret? (Exe: Yes)

Sonic: Okay then *runs away*

Sonic run all the way to his house and he waits until it was night time

Sonic*scared*: I don't want to do this

Then it was night time and Sonic started to get hurt

Sonic*In pain*: Ow! It hurts so bad what is this? (Exe: Our half transformation together)

Sonic: What?

Sonic transformed into half Exe

Sonic*In pain*: Wha...what

Exe: Wow I like this body

Sonic*starts to cry*: Why are you doing this?

Exe: For my goal of course

Sonic*In tears*: Wait why aren't you controlling my body?

Exe: Well I have to rest until my powers come back and I don't have enough power to take control, now rest my friend because tomorrow night it's my time to shine

Sonic*In tears*: Oh god no

Exe*happy*: This is going to be fun