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As Olwen struggles against the tree she's bound against, she can't help but lament her situation. Her hands tied tightly above her, tight enough that she couldn't move from her position if she tried; her legs tied closely together with her rear sticking out in a manner most unfitting for a soldier of Friege, and were this any other circumstance, Olwen would feel humiliated. But the calm, dexterous hand that runs along her plush rear more than ensures her that she has little reason to fret.
Well, outside of provoking her brother into punishing her, but a part of Olwen certainly can't complain about that much. Even with the firm smack that Reinhardt administers, Olwen manages only a flinch and no sound as her legs tremble underneath her, her face pressed into the tree bark and staring off at the river nearby before screwing her eyes shut as she feels her will slipping. She's thankful nobody else is around to see this; this is a private moment, even if it is meant to be a punishment for Olwen being unable to endure the exercise of the day without any sort of break. It was hardly fair that Reinhardt could spend an entire horse ride that she was leading with his fingers agonizing her clit and every bump of the horse making her bladder ache, wasn't it? She could hardly be blamed for wanting to turn the tables on her brother and get him off in kind by grinding against him. It was what little bit of power she could have over the situation, though she should have expected that Reinhardt would see this as cheating. Even with the faint bile that still rests in her throat, the knowledge that this is her brother who's all but become her lover, doesn't stop her from enjoying this.
It's an uncomfortable position, but very intentionally picked by her brother; it'd be the deepest humiliation if anyone else came upon her like this. Rear out, getting spanked like a child, all the while squirming with the blatant need to relieve herself. Her brother's knowledge of this, and his fierce striking of her rear again, and again, and again are pushing Olwen to her breaking point in more ways than one. It's perhaps a small mercy that her masochism keeps her brain at least somewhat of of her aching bladder, though only a small one. No, now her mind simply wanders to Reinhardt's hand, his dexterous, magic worn hands that only come ungloved for her pleasure and hers alone. Oh, how she wants his fingers to bury themselves inside of her, to drive her over an edge that would almost surely coat her in her own humiliation, but it would hardly matter in the moment. The pleasure would be more than enough. But letting her brother get to know and understand her body like this has made him far more fond of seeing just how much he can push her while denying her completely.
The smacking has stopped, and Olwen trembles as she's allowed a moment of reprieve. A moment of want, a moment of simply wanting this to continue so she can come, but also so her brother can free her and she can finally let herself find a quiet spot to relieve herself. If Reinhardt would be that merciful to her, it'd be a blessing in disguise. Instead, Olwen feels Reinhardt's breath wash over her ear, and he plants a small kiss upon the shell of it.
"Tell me, Olwen - are you ready to apologize...?"
Olwen's barely allowed herself a chance to speak since her brother decided to punish her like this, but she finds herself gulping down a lump of air and shuddering out, "Y-Yes. Yes. Brother, I'm so--ah!" Another smack against her rear causes her to cry out, making her shake and tremble as she forces herself to calm. If she doesn't keep herself steady and calm for this, she's going to wet herself like a child--she could never imagine doing that, and especially not in front of her brother. But she knows that isn't satisfactory, especially by the click in her ear.
"Oh dear, I don't believe I quite caught that. Would you like to try again?"
"Y-Yes." Stay calm. Stay calm, stay calm, do not lose control for even a second-- "Brother, I'm--" Another harsh smack draws out a squeak from Olwen, but she perseveres none the less. "--I'm sorry! I'm sorry! I won't act out--" Another smack, this one even harder, but Olwen holds strong as she screws her eyes shut. "--And I won't do anything without your permission again. I swear to you...!"
Olwen feels Reinhardt's hand come down upon her rear, again and again--another hard smack, another one, another one that makes her cry out, and by the time he's found a rhythm, all Olwen can do is cry out again and again. The sad part is that the sting of her rear is barely on her mind, but the pain is making it harder and harder to focus on the arduous task of keeping her bladder in check as she feels herself squirm to try and find some comfort in the position she's in. It's a lovely pain, really, a sore ache that will probably make any horseback riding a chore, but it was worth it. It was more than worth it to know she was being punished, again and again and again, and it makes her stick her rear out further so she can receive her punishment duly.
It's when the punishment stops that Olwen finds herself concerned. She can hear a small chuckle in her ear, so at least Reinhardt hasn't left her to simply soil herself for his entertainment, but Olwen finds herself concerned for another reason when she feels Reinhardt's body start to engulf hers, pressing in close, his--apparently even more erect, clothed cock pressing between her legs as Reinhardt's hand snakes it's way around her stomach and his dexterous fingers find their way under her pants, and that's when the squirming really starts.
"Wait--" Olwen pleads, her body seizing with terror. Not even of her own humiliation, but-- "W-Wait, wait, Reinhardt--Brother, I--"
"Shh." Reinhardt's voice is quiet and reassuring, even as his fingers dip below her underwear and, despite her squirming that only seems to be making Reinhardt's job of finding her waiting clit and pussy all the easier, she feels two of his fingers bury themselves inside of her. "Worry not, my dear sister. You're free to let go as you please."
"But Brother, I--I'm going to--"
"Do you trust me, sister?" Reinhardt's words get Olwen to stop in her tracks, and she feels her shaking only intensify. If he keeps playing with her like this, keeps fingering her like this, she'll come alright--but it'll also come with her wetting herself not only in front of, but on her brother. How is she going to explain that to anyone who comes across them? She's not sure if she can, really, and that makes her tremble all the more in Reinhardt's grasp.
But if there's one thing in the world Olwen trusts, more than anything, it's her brother. Her brother, who always has multiple plans up his sleeve. Her brother, who has always been there for her, that she one day hopes to join in the rankings of Friege's finest soldiers. Olwen, though tears prick at her eyes, nods her head at Reinhardt's words, and she feels him kiss her cheek in response.
"Good girl."
Those words are the only warning she gets before her brother works both him, and herself up into a frenzy. He must have unzipped his pants at some point, at least enough to get his cock out and sandwich it between her thick, clothed thighs as he fucks into them, feeling his cock's warmth as he works himself up on her. But his thumb work in quick, frantic rhythm as Olwen feels all control slipping, and she's biting her lip hard enough to draw blood as his fingers ram into her again and again, deeper and deeper as she feels the pressure of her bladder and the pressure in her pussy push to their breaking points, and all she wants is more, more, she just needs more, just a little more, she doesn't even care if she soils herself because her brother is fucking her and she's shuddering and tearing up and she doesn't care who sees, and...
Perhaps mercifully, Olwen manages to come first, seizing all at once against her brother and only managing a small cry out as she does. But her bladder is unfortunately not too far behind, and her control slips and she finds herself letting go all over her pants, her brother's pants and cock and his clothes, and Olwen feels herself shuddering between both of the sensations. The humiliation of wetting herself stings, and despite herself, she feels her eyes starting to water with tears as she fears she may have ruined herself and her brother's clothes. The pleasure, however, is at least a small mercy, and the afterglow is enough to stave off some of the deeper shame that comes with this. Even now, Olwen wonders what it would have felt like to have people watch. People's eyes on her as she squirms, maybe taking turns with her, maybe seeing how long they could keep it going...
But that doesn't matter, not now. Not when Olwen has Reinhardt, who's pleased hum as she finally calms herself at least alerts her to his own satisfaction. Well, that and the caked, white cum all over the front of the tree and her pants, that he seems plenty satisfied with as he goes to cut her from the ropes that have kept her in this position. In her haze, she barely registers Reinhardt helping her clean herself and him up in the river, but it all comes together as she and he both climb out of the river when another soldier approaches--Reinhardt has an easy story about Olwen's horse proving unruly and bucking them both off that the soldier seems to laugh at, and Reinhardt laughs along as well.
...Maybe it's not so bad, letting her brother have so much control.