Cum in her mouth.

Sarah, sensing that you are close, begins bobbing faster, moaning as she does so, and sending very pleasant sensations throughout your entire body. You rub her shoulders, and every now and then reach down to palm her breasts gently. She coos around your dick when your flesh touches her nipples.

You cry out as your girlfriend stops and pulls back so that the head of your dick is resting on her tongue. She opens her mouth and looks deeply into your eyes, begging you to cum without saying a sound.

You groan and let loose, shooting a rope of cum down her throat. She holds your dick in place and jacks you of, swallowing the subsequent streams of sperm and letting her mouth hold your cock as you spasm.

"Shit," you mutter. Sarah says nothing, just licks you clean, then stands up.

"Do you need some time to recover?" she finally says, stroking your limp dick.