At her tits.

"I'm going to cum on your tits", you moan as you begin pounding your meat. Doe is staring at your cock wide eyed as you jerk off in front of her. You place your free hand on her shoulder and grunt at her, "Stick your tits out!" Doe juts her chest forward just a semen begins erupting from your cock. Strams of hot jizz splatter across her tits.

A surprised, "Whoa!", is all Doe says as you pump your hot load out onto her cute tits. You groan in satisfaction and she smiles wide, happy to have pleased you.

"That was a lot John", she remarks when you let go of your cock.

"The hotter the girl, the mroe there is.", you reply. She looks down bashfully when hearing the compliment, but thrilled that you wanted to have your way with her.