Gwen is running a small Florist and Herbology shop in the capitol city. There she grows and cultivates all kinds of plants for their properties - or just for their looks. Some she uses her unicorn magics to cultivate - making them far more superior and different in many ways to their normal versions. She then makes different products from this and sells. If you enter her shop you can buy ointments to ail all kinds of diseases and pains, skincreme to help your visuals improve, tablets to make you stay up studying all night without losing fatigue, incense to ward of evil spirits, and all kinds of tasty treats.
One day Partran walks past her lil botique and takes an interest as he looks into the display window. As he enters the door-bell pings welcomingly and Gwen greets him. Partran looks around and inspects every little item in the shop, making Gwen happy that he shows such interest. After a small chit-chat where Gwen explains some of the products Partran wonders if there is some books or tome where he can learn this craft of magically induced plants. Gwen tells him they are rare to find, but she could lend a couple of her books to him and give him a small crash course in his laboratory. They agree on a time and meet up two days later on Sunday when her shop is weekend-closed.
As Gwen teaches Partran the basics of the craft, they playfully flirt with each other, in often silly ways it turns out. Eventually Gwen teaches him to give some sexually charges magic into a tea-plant. They harvest the leaves and makes a tea from it. As they savor the drink, they can feel the temperature rising so they undress - both showing off their naked bodies and huge erections to one another. Gwen tells Partran that is the thickest dick she ever seen and says she want a piece of it. After some oral, Gwen ends up with the massive black cock buried to the hilt in her pussy - as it is the thickest cock she ever taken it gives her a pleasure mixed with pain as she can see with her own eyes how her stomach bulges from the sheer girth of it. They keep on going for a couple hours in many different positions and in the end Gwen is completely filled with Partrans seed.
She leaves his home feeling very fulfilled, her altered gait getting weird looks as she walks home.