Board the first bus you see

Sitting at the bus-stop, you decide that any bus will do. You've got nowhere else to be today, so why not go on a little adventure? A few moments pass and a bus pulls up at the side of the road. A long, sleek hover-bus, futuristic in only its capability to fly. Inside is the same interior that buses have had for so many years, with bored looking people listening to music, playing on their phones or, naturally, having sex. Hopping aboard, you sneak a peek at the destination of the bus.
"METROPOLISTONBURG -> LAVERLY BEACH," it reads. A trip to the beach sounds nice, you nod, even though it's over half an hour away. You didn't bring anything to entertain you, but you suppose anyone will do.

Sitting down near the back of the bus, you find yourself sitting opposite a rare sight: a genuine alien girl, here in your town. She's small, maybe about 4'3", with porcelain-white skin. Her jet-black hair matches her eyes, a solid black with cat-like yellow irises. Wearing naught else but a backpack almost as big as her, her surprisingly large breasts and hairless nethers are exposed to the air. If you remember correctly, her kind are known as the 'Astras' people.

You wonder to yourself if you've ever had sex with an alien girl before and come up blank. Your town being somewhat out of the way, you rarely if ever see off-worlders, let alone alien ones. Deciding to take your chance, but also curious about what a girl like her is doing in a place like this, you strike up some conversation.
"Hi," you smile, moving from your seat to the seat next to hers, "How are you? Haven't seen an off-worlder around here for a while."
"I get that a lot," the astras-girl giggles, her voice having a pleasant reverb to it, "I'm on vacation, visiting a human friend of mine. She recommended the beach, so I'm off to meet her." Without provocation or prompt, she takes off her massive back-pack and pushes it under your shared seat before lifting her arms up in the air for you to lift her. Even from another world, this tasty little short-stack is well-aware of your intentions and simply wishes to make it easier for you. The way she is so ready and willing to give you complete freedom to use her body in any way, even in such a public place with a person she's never met before, it turns you on more than anything. If your shaft wasn't already piercing the heavens, it is now.

Reaching over you lift her up with ease, being over twice her size, and gently position her warm slit over your dick. Releasing your grip, her juicy thighs make a delicious slapping noise against your legs as you penetrate her entirely. Her insides grip you tight, warm as an oven, ready to massage you. Her D-cup breasts, completely at odds with her size, press softly against your belly as she leans in to hold you. Just sitting here like this would be enough for most men, but your boner demands you make full use of the situation.
"Sorry, I didn't introduce myself," she laughs as you lift her up, the tip of your cock barely inside of her, "My name is Inea."
Inea simply smiles at you politely as you ram her back down, massaging your length the whole way down. Gods above, you're going to enjoy this bus ride.
You tell her your name as you bounce her up and down, her breasts jiggling in time with your thrusts, her body hanging back loosely as you grip her around the waist, fucking her like a sex-doll.
"What an interesting name!" Inea giggles, cupping her own breasts and teasing her nipples. "Earth is such a fun place. My world is so dark compared to here. So much colder, too! I really love being able to walk around naked, makes being fucked so much more convenient."
You laugh a little at that, wondering how people on her planet could even go about their daily business if they had to keep taking off their clothes to have sex. You just know you'd never get anything done.

Leaning back a little, you decide to let your new short-stack friend do some work. As soon as you release her hips, she leans forward and puts her hands on your chest for support, grinding against your shaft. Her technique is wonderfully refined and thrillingly dirty at the same time, so it isn't long before you cum, painting her insides with your seed.
"Ah, how nice and warm! Everything about this world is so warm!" Inea squeals in delight. You can feel her orgasm too, her insides pulsing gently in time with your sprays of cum. For a moment she sits there cuddled against you, until you realise why she isn't moving. Even though you came just moments before, you're still rock-hard!
"Oho," your new fuck-buddy chuckles, "It seems you're still ready for round two! Feel free to use my body until we get to the beach then, okay?"
'Feel free to use my body,' she said. Shuddering with anticipation, you pull out of her still-dripping slit with gusto and push her face down onto the seat, before ramming your rod into her butt. Inea laughs at your vigour before reaching down into her bag to grab a book, content with you plundering her booty as she reads.

Before long, you've filled her rear with your seed, but still your length throbs with desire. You're beginning to get a little worried. No matter how hot this whole encounter is, surely you should have softened a little after two times, right? Shrugging, you count your blessings. If this perma-boner persists, you'll at least have this little beauty to take the edge off. Lifting her up again, you spin her around till her head is resting in your lap.
"Still hard? Humans certainly have endurance." Inea laughs, her yellow slit-pupils barely flicking up from her book. Still reading, she doesn't even flinch as you ram your cock into her throat, her tongue idly flicking about your dick when it isn't halfway down inside her neck. Tempered by your previous ejaculations, you take your sweet time in orgasming again, taking nearly twice as long as before using her throat. Eventually the build-up is too much and, pressing her head down till her plump lips kiss the base of your length, you release your load directly into her stomach. Firing a ridiculous amount of cum inside of her, she happily swallows it all, breathing deep as you release her mouth.
"Saves me buying a drink." Inea idly observes, your penis popping from her little mouth. Finally, you've gone soft, though you have a feeling it's not going to last.

A robotic voice softly calls throughout the bus, "Next stop, Laverly Beach." Looking out the window, the bus is beginning to descend upon a long, relatively busy beach. The sun is shining, the water looks nice and clear and Inea's head is resting comfortably in your lap, seed trickling down her thigh. Today is going to be a good day.

Clearing off the bus, Inea grabs her massive backpack and follows along with you.
"It was nice meeting you," she grins, giving you a big hug and a kiss on your shaft. "Perhaps we'll meet again?"
It's too bad that Inea has to go, with her having to meet her friend and you having to ... do something ... wait a second ... Perhaps you could just tag along with Inea and meet her friend too? Then again, maybe there's some other beauty awaiting you on the beach ...