Kiss her again. She's just playing hard to get.

Fuck having a boyfriend. Dammit, you're in college. College girls are all sluts. you grab her by the waist and kiss her again.
"What the hell are you doing John? Get off of me?" she screams.
Fuck that. She came out into the woods with you. She left the trail with you. She took off some of her clothes with you. You'll be damned if she thinks she's going to back out now.
You slip off your boxers to show your massive erection and walk through the water towards her.
"What are you doing?"
You don't answer, she looks at you dumbfounded and begins to back away. You are much to quick and grab her by the waist.
"John, please, let me go," she pleads with you.