It was really nice for you to take your new little sister shopping. She never had any fashion sense, even before transitioning. You had already taken her to get a proper haircut, but now she needs the outfits to go with it.
Trying some different styles out on her, you’ve already ruled some things out. Her pretransition clothes basically all have to go, you won’t let your sister be seen in jeans or cargo shorts with a tshirt every day. You gave her a couple dresses to try, and you thought they would look really cute, but she didn’t feel ready for something that extreme.
You compromise and take a few steps back, giving her some tight denim shorts and a girl’s tshirt to try on instead. That’s when you get that look in her eyes, the one where she sees herself as a girl finally. It’s not really that much different from before, but she looks so pretty this way.
She’s in front of the mirror, posing and checking herself out, giddy and excited. You can’t help but check her out too, and you curse yourself for it. You can’t help what you’re about to do next either.
“Okay okay, so we’re definitely getting these for you. Can you please try on a dress, now that you see how fem you can be?” you plead with her.
She blushes hard, suddenly much more open to the idea. “Okay! I’m just nervous big sis..”
“I know, but I’m right here. I wouldn’t let you get anything that doesn’t make you look amazing.”
She starts to slip her shorts off in the changing room with you, but struggles a little. They are really tight… mmm. Then her top comes off, and you finally look away like you had promised to. You hear her putting the dress on, before she finally, nervously asks, “Okayyy… what do you think?”
You turn, and your breath hitches. It’s truly perfect. Tight to her chest and abdomen, loose and flowy around her hips and thighs, with a cute strawberry pattern and pastel pink color that complements her reddish-blonde hair well. “Oh wow…” You weren’t sure about this dress, it was the one she had thought was cute, but you can’t help but stare.
You notice the way it hugs her small breasts, only have been on hormones for a little while. It accentuates the subtle hourglass she’s always had, even as a boy. She twirls and you see just how much her ass lifts the back. Your little sister is hot…
“Are you sure big sis? You’re lying! I don’t know! Ahhhh!” You grab her and shake her a little.
“Sis, calm down. You look fucking amazing. Seriously, you look hot as hell.”
“I mean it! I can’t even begin to imagine how sexy you’re going to be after a few years of estrogen, damn…”
“…sexy?” You need to see more of her like this. You start thinking of more and more things she should try on.
“Hold on, I’ll be right back! I’m getting more stuff for you to try.” You rush out and grab more clothes, noticeably slutty clothes, and bring them back to your sister. “Okay, here. Put these on.”
“This is going to have my whole tummy out big sis!”
“And? That’s a good thing! That’s what girls do, and you do want to be a girl, right?”
“I… yeah… But you don’t wear stuff like that.”
“Well I’m not like you. You’re way more fem than me. Now seriously, put that on, and this too!” You hand her an extremely short skirt.
After some protesting, she turns away from you, her face the brightest red you’ve ever seen. She starts to change, and you don’t move your eyes off her for a second, until she turns and catches you. “H-hey! You said you’d look away!”
“Okay, sorry! I didn’t think it was a big deal. I’ll look away.” You turn away for all of twenty seconds before you look back. When you do, you catch a glitch of her bent over, ass right in front of you, about to pull up her skirt. “Fuck…” you whisper.
She stands up, and you look away. “Okay… how is it?” You look back, and take it in. Her cute, soft tummy, perfectly barren and ready to be marked. Her equally soft thighs, screaming to be squeezed and bit. The top of her chest, not quite enough to consider cleavage yet. She’s perfect.
“You look… like you’re coming home with me, right now.” You grab her by the hand and scoop up the rest of the clothes with your other arm. She practically drag her out of the store, with her freaking out the entire time about everyone seeing her in such a revealing outfit, begging you to let go.
You practically shove her in your truck before you start to take her to your apartment, hand on her thigh while you drive. “B-big sis… Can you move your hand please?”
“Why? I don’t have an armrest, I’ve got to put it somewhere.” This is true, but also an excuse. You could put it between you, or on your own leg, and you definitely don’t need to be squeezing hers…
“It’s just… it’s making me feel… uncomfortable.” She squirms in the seat.
“Why? I’m your sister, we’ve always been cuddly. Why’s it suddenly a problem? Just quit whining.”
“You’re being mean.” Yeah, that happens when you’re horny. Not your fault though, not when this sexy girl is flaunting her ass in front of you. Nevermind that you were the one to dress her.
You pull up to your apartment. “I thought you were taking me home?”
“I said you’re coming home with me, I didn’t say your home.” You get out and head to her side of the truck, lifting her onto your shoulder and carrying her inside.
“W-what-“ she starts as she struggles against you. “Put me down! What are you doing?!” She starts hitting your back weakly as you carry her small body.
Her toss her onto your bed, and climb on top of her. “If I’m going to show you how to be a girl, I might as well make you into a woman…”
Her eyes go wide, and you push yourself against her. She feels how hard you are, pressed against her thigh. “S-sis..?” You nearly growl at her, taking the skin of her neck between your teeth. Her hands latch onto your waist as you do, moans escaping her lips. “Oh, oh fuck! That’s so niceeeee… But w-we shouldn’t…”
“I don’t care.” You laugh evilly. “You’re hard and leaking already, moaning for me too. You want it,” she whimpers at you, knowing you’re right. You lean against her ear and whisper, “Not that that matters…”
She moans and arches her back, “Mmmm, pleaseee! Please rape me big sisss!” Somewhere deep in you, a fire ignites. You weren’t sure if you had picked up on the signs correctly. The last few weeks it seemed like she was flirting with and teasing you. The way she’s always saying ‘big sis,’ and with that tone! And now you know you’re right…
You cover her mouth and start tugging at the new clothes you just bought her. “Don’t fight, and I’ll be gentle, got it?”
You look at her, her eyes sparkling with joy, and she nods at you. You feel her smile behind your hand, and moments later she starts pushing against you. You narrow your eyes, and you both smile.
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