Her tits.

"I'd really like to cum on your tits," you say.

"I knew you were going to say that. All you men are the same," she says with a wry smile. Then she jiggles her breasts for encouragement.

Well, you certainly don't need more of an invitation than that. You climb up and straddle her torso so that your dick is right over her tits. You begin pumping your cock, the sight of her playing with her incredible tits making you desperate to cum. You jerk off furiously and it doesn't take you long before you're starting to hit your climax.

Sarah notices this and squeezes her breasts together, creating some fantastic cleavage. That's a target if you've ever seen one before. As your orgasm hits, you aim your dick for her cleavage as best as you can. The first shot of cum hits right on target, dribbling down between her breasts. The next few are more erratic, haphazardly coating her chest, her hands as they hold her tits together, and some dribbling down to her stomach.

Looking at the cum covered woman below you, you wonder if there's anything more beautiful you've ever seen. Probably not.