Warning: incest content (Daini x Suna), dubcon, age up characters

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In Silicon City University, a young adult named Suna was studying in her room on the campus. It was too late and the final exams were in the corner, so she was trying her best to get the highest grades.

Her dream of being an inventor as her father and friends give her the determination to continue her study. But she was so tired, she was about to stop and go to sleep until she got the unusual visit of a certain tall blonde haired dude who was sitting in the window.

- Still up big sis? - he asked

- I'm gonna get exams next week, I need to study enough if I want to graduate -

-PPPPFFFFF-

Suna just ignored him as she accommodated her books. - Can you go away? I'm going to sleep and the first class is going to start in a few hours

- Are you sure that you don't want some help?~ -

Suna sigh, it's not the first time that they do this in secret. When she was 18, she tried to convince him, without success, to work with her and their brother Aki to defeat a group of robot aliens named stardroids and their leader Sunstar.

To make this history short, Sunstar showed interest in his older sister, which made him feel jealous, (Well, the guy was jacket up looking deity). Before the defeat of the stardroids, Daini "reclaimed" his sister's body when nobody else was watching. Suna didn't oppose resistance since this was the only way that he could help them without him refusing to cooperate.

Now that she is 22... She started stripping in front of her little brother. While she was unbuttoning her pajamas, Daini pulled up his leather jacket and his black tank top, showing his robotic torso.

Daini sat on the bed as Suna was on her knees between his legs. The young brother unfastened the belt of his leather pants, showing his throbbing bulge covered by his boxers.

- You know what's next-

Suna carefully released his almost erected rod, with a hand she started jerking it. Daini moaned softly as his sister started liking his shaft. He petted her head, and without advice, he pushed her, making her deep throating his cock. Once he shoots his pre um on her mouth, he releases her.

She tried to catch up her breath, while she was recovering from that. Daini pulled a condom from the pocket of his jacket.

- Remember that our past times was anal?, Well, this time I want to do something new~ - he teased

- Wow... You are really prepared- with a red face she said in a confused toned

- Hey... I don't want to know if I can have children with humans, specially with my own sister-

- 'At least I know that my renegade brother has some morals' - she thought

Once he accommodated the condom on his rod and Suna prepared her special entrance, Daini gave her the instructions to bend over and spread her legs. Carefully, he introduced the tip inside her, making her yelp of pain.

- tell me when you are ready - the older sister nodded

Finally, Suna told him to continue. The young brother started moving at a low pace. She could feel her inner walls lubing themselves from the pleasure. Small moans escaped from her lips.

Daini started moving faster, the sudden change made her arch her back. Suna begged, telling him to go harder and faster. He obeyed just to hear her begging for more.

- you are a needy bitch- he said that on her ear before both siblings came at the same time.

They made up for a while, until he pulled out his rod. Daini took out the condom and threw it in the trash can in the bathroom. He helped dress his sister with her pajamas. After he dressed himself he muttered - good night big sis ~-

- good night lil bro ~ - she answered, she could hear her brother leaving the room through the window