Preparation

After taking the bus downtown you text your aunt as you approach the plain dark glass building where her laboratory was. Her assistant Lucy, a stout black woman of few words, meets you at the back door and leads up you up. You had made this trip twice already for testing and prep in the previous days and you knew the drill. First you are taken into change rooms where you undress and leave your belongings. Then, naked as the day you were born, your bare feet cold on the tile floors, you are ushered into lab turned surgery. There were two plain metal platforms set up side by side for you and your sister. There are stirrups already in place where you would be putting your legs. A shudder runs through you as you try to shake the thought that the sterile lab looked more like a morgue than a hospital.

El already sat on her table when you get there. She had a white sheet around her shoulders but, like you, was otherwise naked. During your previous visits here you’d already seen her nude but your breath is still taken away by her soft, curvaceous, smoking hot body. Feeling cold yourself you quickly pad across to her and hop up beside her. She welcomes you into her sheet, putting it around your shoulders too then pressing her warm body against your side. Huddled together and giddy with excitement you giggle and smooch like a couple of silly kids.

Lucy just rolls her eyes. “Alright you two. Do your thing and hit the call button once your done.”

“Yes Ma’am.” The pair of you say in one voice, which causes another round of giggles.

The “thing” Lucy referred to was masturbation. Peg claimed there were good medical reasons for this though you suspected it was her way of trying to lure you into the family way of life, something you had resisted thus far outside of that initial “race” you and your sister’s had those months ago on the day of the big reveal. It was no matter. As weird as this all was you were more than happy to do it.

With Lucy gone it is just you and Elsie in the room. Your giggles fade and an awkward silence descends on you.

“We…we could ask for separate rooms.” Elsie suggests.

“No, I’m okay.”

“I’m okay too!” She replies too quickly, revealing the fact she very much wanted to stay together. She then says sheepishly. “Jesse?”

“What’s up El?”

“You don’t think I’m a coward for doing this, do you?”

“A coward?” The thought had never crossed your mind. “Of course not! If anything you’re brave. It takes courage to shake things up like this and fight for what you know is real and right. The easy path would have been to do nothing and go with the flow.”

“It’s not…selfish?”

“El.” You grip her soft thigh. “No, you are not selfish.”

“I can’t…I can’t thank you enough.” She struggles. “I wish I had the words too…”

“Stop.” You say softly. “You’ve thanked me enough. I am happy to do this for you. Really El, don’t even worry about it.”

“I love you big brother.” She hugs to your arm as you kiss her head. “I’m glad you’re here. It’s easy to be brave when I’m with you. I’m glad…you’re a part of this.” She sighs softly and rubs the area just above her dick. “And soon, soon you’ll be a part of me.”

“And you me.” With anybody else swapping body parts would have seriously creeped you out, but with Elsie it felt strangely natural. In some indescribable way El already felt like a part of you.

“We should hurry up. They’re waiting.” She reaches behind her and brings two small white towels and a tube of medical lubricant gel around to sit by her leg. She passes you one of the towels then pauses to look down at your shriveled dick, shrunk by the cool of the room.

She sighs again and whispers, almost to herself. “I wish I could have held out longer. You’ll be too big for my little hoochie-coochie after this.”

You chuckle. “Little hoochie-coochie?”

Elsie giggles. “It’s what Chloe calls it.”

“El, waiting wouldn’t have helped.” You assure her. “I’m not having sex with the family. How many times do I have to say it?”

She gives you a mildly sad knowing smile. She didn’t believe you yet didn’t hold it against you. “Of course.” She gives you a little peck on the cheek. “But it would have been amazing.”

With a smile you just nod, she was surely correct about that.

“Give me your hand.” She says. You extend your hand, palm up, and she squirts a dollop of the lube onto it. She puts a bigger blob into her own hand. She puts the tube down and slips her left arm around you and leans her head into your shoulder. “I’ll follow your lead.”

Resting your head on hers you start to smear the still cold clear gel over your manhood, one last fap with it before you said goodbye. The slick wet sounds of the gel squishing between your hands and cocks are the only sounds in the room for the next few minutes as the pair of you rub yourselves to hardness. In this cold sterile environment brother and sister sit and stroke their gleaming hard cocks in time with one another. At her last measurement El had broken the 10 inch mark and she looked ever inch of it, her dick utterly dwarfing your humble 6 incher.

“Do you want to touch it?” Elsie asks sweetly. “It’s soon going to be yours anyway.”

God that was weird to think about, but she was right. By morning it would be between your legs. After a short pause you reach over and take it in your hand. Fuck it was thick!

“Can I touch yours? It’ll be the last time I can.”

Trying not to think about the fact she was referencing the fact you were about to have your dick chopped off you nod, it was only fair. Pulling her arm from around she lubes up her other hand and takes your manhood in her gentle grip. Just like that mutual masturbation had turned into mutual handjobs and that changed made all the difference. The feeling shifting from good to great. With no other inspiration available you and Elsie ogle each other’s bodies, at first blushingly but soon openly and lustily.

“God you’re beautiful.” You huff, her soft hand working your meat with a deft touch. “Mmmm.”

“You too.” She says. “So handsome.”

You admire El’s tool as you stroke it. Big, thick, straight, and just…nice looking. A guy couldn’t ask for a finer cock. “You won’t miss it?”

She shakes her head. “Don’t get me wrong, I’ll miss the double orgasms. When they happened they were…intense. But no, it never felt right.”

“The other’s will miss it.”

“Yeah.” She admits. “Especially Chloe and Mom. Even Fiona.”

“Oh?”

“I’m as big as Chloe can handle. She likes to challenge herself with me. Mom just likes big ones period, I’m even a bit small for her.” She says. “And Fiona…well, she says I’m perfect. Not too big and not too small. When she’s not teasing me that is.” She then adds in a small fragile voice. “I don’t like being with Fiona. She’s too…rough.” Very subtly she shifts even closer to you, as if trying to hide inside of you. Her voice so tiny you could barely hear it she whispers. “She hurts people Jesse. She…hurt…me.”

“Hey, shhh.” You could actually feel her dick soften a touch at the mention of your bully of a big sister. You had learned of Fiona’s sadism in the months since the reveal, it hadn’t surprised you. “You don’t ever have to be with her again. Don’t think about her. Just look at me El.”

With a shudder and a shake of her head she snaps out of it. “Okay.” The precious smile she gives you fills you with life.

“What are you going to do once it’s over?”

“Jeans!” She peeps. “I want to wear jeans. And short skirts. I want to go swimming! I just want…to live. To fit in. To be who I’m meant to be.”

Her words and her joy remind you what this was all for and eases any worries you might have had.

Together you settle back into a nice easy rhythm. As with the race you cum well before her, shooting your load into the towel provided for you, but with your naked body fueling her desire Elsie climaxes only a few minutes later. You smooch and cuddle for short time in an easy natural way you only wished you could have with Allison then lovingly clean each other up. Looking into each other’s eyes you felt at peace. Together you and El could face anything.

It was time.