Arthur look at nami in the eyes and smile as he said "it's a very special mark." He put his hand over Yumi hips and pull him closer and hug both of them as he continued
"I am very special. Not like normal Humans. When I have sex with someone and also I love the person and wanted to be with her, "Always and Forever" then this mark will appear on them. It's proof that we are now connected by body and soul."
He then look at them and said "as of how something magical can happen that's for later. Now, do you mind that I mark you without asking?"
Nami and Yumi both look at each other. They feel like they have eaten something very sweet. Both of them smile a very genuine sweet smile and kiss on both sides of his cheek. Both of them said together "I also want to be with you forever. I love you."
They then kiss him on the lips. Arthur again became hard. Nami also feels his hard dick inside her. She smile and said, "you are hard again."
Yumi said, "it's my turn." And change her position with Nami.
~scene change~
After the dinner kyouka, Yuki and Koharu with Arthur went to the hall room and start watching TV. Yuu didn't want to watch anything. He went to his room to sleep.
Yuki said "mom?" Kyouka understands her daughter she shake her head and said "let's go to my room."
Yuki smile and pull Arthur as she said "let's go to moms room dad." Kyouka blushed at her daughter calling her cousin, dad.
Arthur slap her butt and said "you have some hot kinks. But I am not a dad but stepdad."
Yuki laugh and said "same, daddy" Koharu also blush with her mother.
~scene change~
"Who you want to eat first daddy?" Yuki said as she take off her clothes. Kyouka helps her eldest daughter with her clothes.
Arthur pull Yuki and said, "let's help my stepdaughter first." He kisses her and pushes her on the bed.
Arthur spread her leg and start licking her pussy. Yuki moan and said, "dad your mouth is the best."
Kyouka heard her daughter and look her weirdly.
Koharu is also naked now. Kyouka grab her daughter's breast and said "you have developed well in this area."
After Arthur thinks that she is wet enough and ready he stops licking Yuki. Yuki look at Arthur and saw that he is setting his dick on her vagina. She saw that her mother and sister is also looking at her. She felt hot seeing that they are watching.
Arthur set his dick and said, "are you ready?"
Yuki look at his mother and said "mom, dad is gonna take my virginity." Kyouka smile at her daughter. Yuki the look at Arthur and said "come Arthur makes me your."
Arthur nods and pushes his dick head inside. "Uh," Yuki said as she fell his fat dick going inside. Arthur stops feeling a resistance inside her pussy. He looks at Yuki as she also looks back. She nods at him.
Arthur pushes his dick inside with thrush as he tears her hymen. Yuki Yelp as she fell pain inside her as her eyes become moist. Arthur kisses her lips to ease her pain.
After a minute Yuki said, "you can move". Arthur then slowly start moving his hips in and out. He increases his speed with time.
In just a minute he starts fucking her roughly. Yuki also didn't hold back her moans. They don't know if their neighbours heard them or not.
Yuki also keeps saying "fuck me harder daddy."
Kyouka and Koharu also sit on the couch as they masturbate. They only look at each other only once and didn't look again. They use their finger as they rub their pussy lips and watch their daughter/sister fucking their Cousin/dad/nephew/husband.
After ten minutes of sex, Arthur cum inside Yuki and use both sperm control and D ability. A red love mark appears on her abdomen. Kyouka notice this time clearly. She smiles seeing this. But Koharu didn't see anything.
After a while, Arthur takes out his dick from inside of her. As white liquid start to pour out from her.
Yuki lay on the bed and take a heavy breath. She finally understands the pleasure of sex.
Arthur looks at the laying Yuki and then shift his eyes to the other duo. Their eyes meet. Arthur walks to them and moves his hand toward Koharu.
Koharu smiles and holds Arthur hand with her.