First time trying my hand at writing erotica, wrote this in forty minutes, english isn't my first language so feel free to point out any grammar or spelling errors.

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The brickwork is rough and cold against her skin, the delicious, dizzying heat on the other side of her merely heightening the sensation. There is a possessive hand on her hip, another roaming inside her shirt, roughly enough to press her back fully against the wall, gentle enough to have her making little mewling sounds against the assault of lips on her throat.
“Oh… Please, more.” The girl whispers. There is a breathy chuckle near her collarbone, accompanied with a puff of air that feels scalding against the chilly night air and travels from her neck down to the valley between her breasts, spreading like the gentlest of caresses. The slight stimulation is enough to have the girl throwing her leg around the man’s hip and pulling him closer, wrapping an arm around his midriff, fisting the other in the semi-long locks of this mysterious paramour and pressing fevered kisses along his jaw line, nipping at his ear a little harshly in her desperation for hotter, faster, more.
The hand inside her shirt grows bolder, rougher in response, rolling her nipples in a way that is somewhere between pain and pleasure and she can’t help but throw her head back when he thrusts against her at the same time. There is barely any room between them and the friction of his jean-clad thigh against her cunt sends ripples of pleasure through her body. The combined assault of his thigh and hands make her dizzy and she pulls him closer to her face by his hair.
The kiss between them is not gentle. She is much too turned on to consider anything but a mutual devouring satisfactory and he is gentle only when it suits him, and the wet friction of tongue against tongue coupled with the teasing little bites she delivers whenever she can make them drive him to press her against the rough brick harder. The hand that was previously resting on her hip is now sliding on the outer edge of her thigh, caressing the soft skin behind her knee before returning upwards to cup her bottom, making her grind against him.
Harsh, panting breaths and low moans fill the previously silent alley. The scrabbling hands on his back release quiet scratching sounds and the pressure between both their legs is unbearable. It is the girl who breaks first, sliding a hand to pop open the button of his jeans and slipping a hand inside his boxers to grip him roughly. The gasp he makes is quickly swallowed by her, as is the shuddering yelp when he spills his seed some moments after.
A breath later, the man is on his knees, his hands pressing her hips into the wall while he rips her panties down her legs. The first cool breath of air against her nether region sets her shivering, and the man does not disappoint. He licks confidently, knowing what is well-received and what is not and the girl bucks against his hold, biting her hand to hold in the keening wail she so desperately wants to release into the night air.
It is when the man wraps his lips around her clitoris and sucks that she finally comes, shuddering violently. Harsh breaths slip her lips while she regains herself. The afterglow fades quickly, leaving the man to rise and press one last, burning kiss on her neck before he leaves the alley. The girl follows his example after straightening her dress and hair as much as she can.