The Naughty
A 60-year-old man called his young neighbor, an athletic 20-year-old guy, to help him with some repairs around the house. The boy accepted without thinking, always ready to help. While they were checking, the old man told him that he had to go out and left him alone, without imagining what was going to happen next.
The young man, in no hurry, was still checking when he heard Marina, the hot girl who lived there, in her room studying. He couldn't help but get closer and, when he looked out, he saw her concentrated on her books. Marina smiled at him, and he stayed still, feeling the sexual tension begin to rise between the two.
Marina, noticing the situation, asked him something about what he was studying, which curiously was about reproduction. The guy started to explain, but the talk became more heated until they stopped talking and touched each other. What started as a conversation ended in an explosion of desire, with both of them enjoying the moment as if they had been waiting for it forever.
I would have liked to have seen vaginal penetration also, and there should have been more foreplay, primarily some oral before anal. He should have lathered up her butthole with saliva by performing some enthusiastic anilingus. Since she was supposed to be innocent, the anilingus should've tickled some at first, as is usual with someone inexperienced; I would have loved to have seen that reaction!