Jaime Lannister X Y/n - Tumblr Posts
Headcanons for Jaime Lannister x Little Sister!Reader x Cersei Lannister

TW: nsfw material lol, incest, SEXXXXXX, afab reader, she/her pronouns
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-as jaime and cersei’s beloved little sister, you lead quite a charmed life; you are your father’s favored child as well as your mother’s until her untimely death, and then you are tyrion’s favorite sibling, the only one to openly show him any form of familial love since jaime does not do so in front of cersei or your father
-cersei treats you as her little doll growing up, she loves dressing you and helping you do your hair, she insists on you sleeping in the same bed as her, the two of you whispering secrets to each other deep into the night
-as jaime’s precious little sister, he is constantly trying to impress you with his self appointed role as your protector, he thrives off of your praise and acknowledgment
-being only two years younger than the twins, the three of you are exceedingly close, always spending time together, going on little adventures
-jaime and cersei begin their more intimate interactions long before they ever even consider involving you in them
-in their minds, you’re their pure, chaste, beloved little sister, how could they ever plan on doing anything so depraved, so wrong, with you?
-then, when you turn eighteen, your lord father starts pushing for your marriage to lord eddard, wanting to secure an alliance with the great northern family
-now this is something jaime and cersei will not let happen
-how dare their father try to send their precious little lioness so far from home to wither in that frigid wasteland?
-cersei is the first to make her move, when the two of you are in the bed you still share
-she kisses you for the first time that night, insisting that she’s merely teaching you how to please your future husband, that this is all normal for a big sister to teach you
-it’s when jaime walks in on cersei with her head between your legs, your head thrown back in ecstasy, that he realizes he wants, no, he needs to be part of this
-he pulls cersei off of you, kissing her, tasting you on her lips, savoring the feeling
-then, the two of them turn on you, matching wicked grins on their faces
-the first time, they make you watch them as they fuck, wanting to see your expressions, your reactions to them; judging by your flushed cheeks and the thin sheen of sweat upon your brow, you liked it quite a bit
-then, cersei states that it’s time for you to truly learn how to please a man, so that you and lord stark may have a very happy and..: fruitful union
-she has you take Jaime’s cock in your mouth while her tongue works wonders on your cunt
-cersei loves the taste of you, she loves making you taste yourself on her tongue after she fucks you with it
-but when jaime finally manages to get his face between your legs, you nearly black out from how many orgasms he manages to pull from you, his tongue and fingers working your wet little cunt over and over as he spews depraved filth about fucking you and filling you with a lion cub rather than a wolf pup
-the three of you continue like this for some time until you are meant to leave for winterfell, alas Robert’s rebellion breaks out and your beloved sister, after robert wins the war, is married off to him
-with her and Jaime both in king’s landing while you remain at Casterly rock with your father, you are miserable
-then, hope emerges in the form of renly baratheon, a man whose interests lie elsewhere but remains in search of a wife
-needless to say, the night you are wed to renly, it is jaime who takes your maidenhead and not your lord husband
-you keep renly’s secrets and he keeps yours
-for example, does anyone need to know the reason the king’s brother’s wife screams from pleasure every night is at the hand of her own brother and sister?
-no, the two of you think not