Those who think it's not normal, think about it, these are strangers to each other. That's why there's nothing wrong with it. Two adults of different sexes are at home alone, hormones are splashing in both of them. So the skinny blonde was not at all against caresses from her stepbrother, she only broke down for show, but with his insistence his brother showed the seriousness of his intentions, and that this will not go beyond their bedroom. Both are happy at the end!
Lucky for the guy - now he's gone from a wanker to a stallion. She, as a woman, appreciated his dignity, and as a bitch, she couldn't resist the temptation to take his pepper in her mouth. Now he would be spanking her mama every day, and she would be taking his cum in her cheek. Happy day!