How about "I want you more than I've ever wanted anyone in my whole fucking life."?

[He's not backing off, far from it. She's gonna have to be the one to ... and he can see that she isn't going anywhere. There's actually a thin smirk on his face. Good. He'd be pretty fucking sad, actually, if she left now.]

Makes two of us.

[And Dave figures there's been enough talking here, and he just leans town to kiss her. His kiss is lustful, hungry. He's wanted this for a long time, and been denying how much he's wanted her for just about as long. His hand rests on her hip, caressing it while he kisses her like there's no tomorrow.

Because he's not entirely convinced there is going to be one.]