(Y/N is seen sleeping in his room. Yang gets in and takes the opportunity to slowly take off his pants and see his manhood.)

Yang: Hmm, how about make my little bro's friend here bigger?

(Then she starts sucking his manhood, and then he rubs it between her boobs.)

Yang: (in mind) I never thought his cock would be so delicious. I could gobble this everyday.

(Suddenly, Y/N's moan is heard, and then he wakes up to see his sister sucking his manhood.)

Y/N: Yang? What are you doing?

(Then Summer and Raven come in wearing nothing but undergarments.)

Raven: How disobedient, Yang... hogging all the fun to yourself...

Summer: You could have waited, Yang.

Yang: What? I can't help it if my brother is a cute boy.

Y/N: Even you, mom and aunt Raven?

Summer: Don't be surprised, my baby boy. We would be fated to fall for you someday, especially after you helped to save me.

Raven: You're stronger than your father. That's why your mother and I killed him.

Summer: Now let's enjoy ourselves this family reunion.

(Then Yang decides to insert Y/N's manhood into her womanhood while Summer sits on his face.)

Summer: I guess you know what to do, right?

(Then Y/N starts licking Summer while Yang bounces on his manhood.)

Yang: IT'S WAY BIGGER THAN THE OTHERS! WAY BIGGER!

(Raven uses one of Y/N's hands to rub her pussy, and soon the room is filled with moans. Five minutes later, Y/N feels his member twitching.)

Yang: I CAN FEEL IT TWITCHING, LITTLE BRO! GO AHEAD! CUM INSIDE YOUR BIG SIS!

Summer: (moans) I'm cumming too... take mommy's love juice.

(Then the three cum together, and then Yang gets off as Summer bends over and shakes her ass.)

Summer: Now it's my turn.

(Suddenly Raven sits on Y/N's face.)

Raven: Well, now it's my turn to feel you lick me, nephew.

(Then Summer slams her pussy on his dick while Y/N licks Raven.)

Summer: (moans) Yang was right, Y/N is way big.

Raven: (moans) And good with his tongue.

(Y/N keeps licking Raven while Summer bounces even faster, and after eight minutes, they end up cumming together.)

Summer: That's so warm...

Raven: You're really the best, nephew.

(Then Raven helps Summer to get off, and starts slamming her womanhood on Y/N's manhood. Knowing that struggling is pointless, Y/N simply puts his hand on her hips and helps her to bounce faster.)

Raven: (moans) Oh, god! This feels so good!

(Raven moves even faster and after some minutes, Y/N cums inside of her. Then the three lay down next to him.)

Yang: I love you, little bro.

Summer: So do I.

Raven: Me too.

Y/N: I love you too...

(That's how Y/N's sister, aunt and mother joined his Yandere Harem.)