I think he's saying that he met this girl and basically wanted her to go back to his house so they could have sex. Pretty obvious. But the part about clenched hands is maybe saying that she's trying to resist and pretend like she doesn't want to go, but she's giving herself away because it's obvious she wants to go. He's asking her over and over again, trying to get her to say yes, and she's smiling and pretending to be innocent when they both know that she's not.
I think he's saying that he met this girl and basically wanted her to go back to his house so they could have sex. Pretty obvious. But the part about clenched hands is maybe saying that she's trying to resist and pretend like she doesn't want to go, but she's giving herself away because it's obvious she wants to go. He's asking her over and over again, trying to get her to say yes, and she's smiling and pretending to be innocent when they both know that she's not.