Pull out and paint her ass.

As you start to approach your peak, an appealing image fills your mind. "I think I'm gonna cum on your ass," you announce, your own pleasure making it a little hard to get the words out clearly.

The brunette lets out another groan of annoyance. "Fine, whatever. Make me sit in a puddle of cum on the bus, why don't you? Least you don't wanna get me pregnant or something."

Without responding, you continue fucking her, spurred on by your resolution to paint her glorious booty and sexy back with your jizz. As you continue toward the big finish, a nearby sound distracts you somewhat: a set of approaching footsteps. Glancing over, you spot another man approaching the bus stop. He's a good bit older than you, maybe early forties, and looks like another office worker by his outfit. Catching his eye, you flash him a friendly smile. He returns it, quirking an eyebrow appreciatively at the scene unfolding by the sign.

"You waiting too?" he asks.

You nod. "I am. Just figured I'd have some fun with this baddie while I had time." Pulling one hand back, you lay a quick slap on her ass, letting it jiggle while you resume your grip on her breast. The brunette fails to hold back a gasp.

The stranger smirks, looking down at your hips clapping together. "Nice. That's how you do it." He chuckles. "Damn, wish I could have a turn."

The brunette shoots him a glare. "In your dreams, dude!"

The presence of an audience gives you an exhibitionist thrill, and you can't hold back any longer. It's time.