Feeling the softness of her hands slowly stroking his dick, Alex started to feel the warmth rise in the atmosphere, and he slowly succumbed to the feeling of his sister's hands.
Seeing Alex's reaction, Isa started to increase the speed of stroking his dicks and felt the heat coming from his cock. Feeling this, Alex immediately grabbed his sister's left boob and bit her nipple. This action of Alex brought Isa's pain mixed with pleasure. This very move was new for her, so she almost orgasmed and reduced the speed of stroking Alex's dicks.
Seeing this, Alex again bit on her nipple; this time it made her cum, making her eyes roll up in pleasure and making her tongue fall out of pleasure. Seeing her face like that made Alex want to make her cum again, so he turned towards her to see her venerable state of a face with her eyes rolled up and her tongue falling out of her mouth. He bent and caught her tongue with his teeth and started to suck it with his tongue, and slowing down, he went for a lip kiss. Both their tongues interacted with each other, exchanging saliva.
Feeling this unexpected kiss from his brother, Isa's body started to heat up, producing more love liquids from her pussy. While kissing, Alex started playing with her left boob roughly by kneading them to whatever shape he desired, and his right hand started sliding through her body. He stopped his hand near her pussy and directly injected his three fingers into her pussy. This action made her cum again.
Injecting three fingers into her pussy made her cum for the second time, and her mind went blank. She was near the brink of losing consciousness, but Alex did not stop. He broke the kiss, let all the saliva flow from his mouth to her mouth, and started moving three fingers in and out of her at a very fast pace. Her sister tried to stop him but couldn't move due to her feeling orgasm. Alex increased his pace and added another finger to her pussy, and immediately she cummed another time and lost consciousness.
Alex sees his sister unconscious due to an orgasm, but his dick is still hard. Watching Isa sleep, Alex got an idea. He stood in the bath and opened his sister's mouth, slowly keeping his dick inside her mouth, and started to move his cock in and out of her, feeling her soft mouth and tongue with saliva fluids. Alex had a cunning smile on his face. He pushed his dick inside her mouth, deep-throating her, and he lifted her body by keeping her cock in her mouth and turned her body upside down so his dick was inside her mouth and her pussy near his mouth. While he was standing, he was staring at his sister and mouth-fucking her simultaneously in the standing 69 position.
He used her mouth as pussy, deep-throating her while licking her pussy and biting her clitoris. He used his sister as his plaything. Isa, even while unconscious, feels choking in her throat and the pain of biting pussy, but strangely, she also feels high-level pleasure coming from her body, and she started to release the love liquids.
Seeing his unconscious sister releasing her pussy juices, he increased his pace in deep throating and licking her and ejaculated his semen inside her, and at the same time, she was also unconscious.
After cuddling inside his sister's mouth, he slowly dropped her in the tub to be cleaned, and he also slept on her boobs by licking her nipple in his mouth.
After a while, Isa woke up, and they both got out. When his sister asked Alex what happened, he just lied and said that she fell unconscious due to the heat of the bath. Isa didn't believe it, but she kept it that way.
They both dressed up and got to the lower floor to have lunch with the family.