Why not?

The dress is a simple but fine piece. It is a red farthingale with long white sleeves and it is embroidered with a complex pattern down the middle. Most girls would kill for such a dress, except perhaps the highest of nobility who would want something more extravagantly expensive. Still, you wonder if a sav- erm, native would appreciate such a thing. Nevertheless you cough up the required amount and stow the dress away in a carriage, with you riding along.

You arrive back at the plantation to little fanfare, your mundane arrival drawing the attention of few, and not for long. You unpack the handful of things you bought, though you handle the dress with embarrassed secrecy. It's not like anyone but perhaps Diego would even understand what it is, but still you feel the need to hide it. You lay the dress down in your room and leave it there for now. You look around trying to spot the girl from before. You can't see her, so you look for her father. "Elderly one, where is your daughter?" you ask. He turns slowly to see you. "You mean Yahima? I have more than one you know." You sigh. "I guess. You know which one. The one who...chose me." He nods sagely. "Yahima then. What do you want to see her about?" You look around furtively before answering. "I bought something for her" He chuckles warmly, to your annoyance. "Don't mock me old man. Do you know where she is or not?" His chuckles finished, he looks thoughtful. "Try down at the beach. She plays there sometimes with her friends." Finally, a straight answer. "Thank you old man. Be well" you say before wandering off. The beach he mentioned is probably the small inlet you've learned is near your property. Taking a horse, you ride off to try and find her.

The ride is short, and before you even break the treeline you hear the sounds of laughter and splashing. Once you get through the dense foliage, you see the small semicircle of sand marking the inlet, and the light blue water contained in it. A number of young women are in the water, swimming and playing in the shallow water. You catch sight of the girl you're after, throwing water into the face of her surprised companion. You enjoy the sight of the pretty young girls in the water, as clothes-less as ever, before you remember why you came in the first place. "Yahima!" you call out, dismounting. The girls look at you, startled by your yell. They recover soon though, and Yahima begins walking through the water towards you as her friends giggle as jest at her in their language. When she gets close, she stands there questioningly. She's quite a sight, sunlight reflecting from her wet, supple body, dark hair lying flat and soaked around her shoulders. You gulp as you collect yourself, momentarily overcome by desire. "I have something, for you. Come with me" you say, pointing to the horse. She seems to at least understand that you want her on the horse and walks over to it, standing by it unsure of what to do. You come up behind her and put her hands on the saddle, then lift her foot into a stirrup. She's still wet and smells strongly of seawater, to no surprise. Finally, you take her other leg and swing it up and over the horse's back, inadvertently exposing her pussy to your eyes as you do so. You can feel your mouth start to water, but you contain yourself for now. She scoots back to make room for you, and you mount gracefully in front of her. You stroll back slowly on the horse together. You are an expert rider; Yahima not so much. She clings to you tightly despite the slow pace, having a hard time adjusting at first. It feels nice to have her warm, soft body and perky breasts pulled up against you, even if she is getting your loose shirt a bit wet. Even though she seems to get used to it eventually, she doesn't break her grasp around your waist, which you rather appreciate. The sun is starting to go down now, and it's getting dark under the canopy.

When you get back you help her down, and she looks grateful to be back on her own feet. You lead her inside your small house to show her the dress. Picking it up by the shoulders, you hold it out, displaying and offering it to the native girl.