In her mouth.

You decide that risking a kid isn't worth it, so you pull out. You take your hand off of her mouth, and she doesn't scream. She just looks frightened.

"Don't do anything stupid Doe, it'll all be over soon. You just have to do one more thing." You lift your cock up to her face. She starts sobbing and quietly repeating "No no no no no no no".

"It's this, or your pussy." That loosens her up a bit. She takes it in her mouth, and to her credit, she does quite well. She licks all over it, really works the shaft, and in no time, you cum in her mouth. You make her swallow it.

You roll off of her. She looks at you blankly for a moment, then smiles.

"You know what, John? That ended up being pretty fun."