Alex stood quickly, her eyes shyly downcast. Once on her feet, she fidgeted, pulling at the fingers of her left hand with her right, not sure what to do.

Stepping in, Justin took her chin, tilted her face up. "Look at me." She obeyed immediately, and he smiled. "Very good. Now, I want you to stand here and be still. I'm going to take your underwear off of you. Understood?" Alex nodded and swallowed for an answer, and Justin's smile grew.

He stepped behind her, then, and she turned her head automatically to follow, then stopped when his hand spanked her butt. "I said, be still." Blushing, Alex turned her face back to the front as Justin took the clasp of her bra and opened it.

For a moment, he held the straps, keeping it on her, and then he let go, put a hand on each of the shoulder straps, and glided it off of her. She moved her arms to cooperate, and wasn't smacked for that. Still behind Alex, Justin put his hands on her waist, then glided them across her smooth skin up to her breasts, cupped them from behind. He stepped in close as he did that, and Alex could feel him against her back, his breath disturbing her hair, his erection protruding against her through his shorts and her panties.

His hips rocked slightly, and he kneaded her breasts gently. "Mmm... you've filled out nicely, Alex. Very nicely." She blushed again at that, then breathed in sharply as he pinched her left nipple. Justin's head lowered, and he kissed her where the curve of her neck blended into her shoulder, then nipped lightly, enough to hurt, but not enough to leave a mark.

Alex shivered at his left hand moved off her breast, down to the waistband of her panties, and started to tug them down. He did it slowly, an inch at a time, alternating sides, continuing to kiss and nip her shoulder and rock his hips against her. He'd moved back and forth five times when he pulled his hips back and made the final pull, letting her panties fall around her legs to the floor.

Then he turned them, pulling Alex along, faced the pair of them at the mirror. Alex blushed again to see her own nakedness, with her brother pressed behind her. Her nipples were visibly erect, and she watched as Justin slid his hand across her belly, up to her breast, fondled it, then slipped it back down, reached between her legs, began to touch her there.

"You're perfect," he whispered into her ear. "There's not a thing about you that I don't love." Then he slipped a fingertip inside her folds, moved it up and down just a little. "Do you want me in there, Alex? Do you want your big brother to take you there?"

"Yes," she whispered, and it came out half a moan. Justin smiled at her in the mirror, then turned her around, kissed her hard on the lips, with a hunger and intensity that she thought was the most she'd ever felt from him. It felt like her lips might bruise, but she didn't care as she pressed herself against him, wanting to give herself to him completely, to be entirely his.

A minute passed before he broke the kiss, looked into his little sister's big brown eyes. "There's something I want you to do for me first," he breathed out. "Show me how much you love your big brother." His hand pressed lightly on her shoulder, urging her down, and she swallowed, then nodded as she realized what he meant.

Alex went down on her knees in front of Justin, then pulled his shorts down, exposing him. Right in front of her face, he seemed huge, and she took him in her hand, looked up at him for reassurance as she moved her hand slowly back and forth. Justin settled his right hand on the back of Alex's head, stroked it, then gently pressed forward, said, "Take it."

She nodded up at him, leaned slightly forward and kissed his shaft, then the tip, then gently licked it. Justin made a noise, and she looked up at him again, saw that he was looking down at her, smiling. "Take it," he said again, "before I just have to put it in you."

And then Alex smiled back up at him. "Make me take it," she said.

"Mmm...." Justin smiled more, tightened his fingers in her hair, then pulled Alex's head forward, moved his other hand down to guide himself to her lips. She resisted, trying to turn her head to the side and pushing at his hips, but with no real force, and Justin easily slid himself into his sister's mouth. She began to suck as soon as he did, and a shiver ran through him at the sensation, and his hips automatically began to rock.

She moaned around him, and that felt even better. Justin rocked his hips faster, but didn't push forward very far, not wanting to hurt her. The feeling was very intense, though, and he had to slow down after only a few seconds, wanting to save himself to take her fully tonight.

A few more moments, and he pulled out of Alex's mouth, stooped to take her under the arms and raise her up to a standing position again, then took her by the hip and back of her head and kissed her deeply. Breaking the kiss, her put his nose and forehead against hers, smiled into her eyes, and said, "I love you. Thank you for that."

"You're welcome," she answered, then moved in to kiss him, this time, grasped one of his wrists and moved his hand against herself. She broke the kiss, then whispered to him, "Justin... I'm so ready for you. Take me."

"I'm going to. But first, we need to take care of a little something, since we don't have a wish to do it for us." He stooped, reached into a pocket of his shorts, took out a condom in its wrapper. Smiling, he tore it open, took it out -- and then Alex took it from him, grinning, knelt back down, kissed him there again, then unrolled it onto him before standing back up.

Alex let out a little squeal of surprise as Justin lifted her off her feet, stepped to the bed, then lay her on it. He crawled onto the bed over her, moving his legs in between hers, then pushing her legs up and apart. He stroked her hair, and kissed her gently, while Alex reached and placed him at her entrance. "Please," she said, "please...."

"Mmm... ask me very nicely, Alex."

"Please... please take me."

"Take? You're a big girl now, Alex. Tell me what you really want." Justin was grinning now, eyes gleaming.

"Please..." She blushed, and her voice dropped to just above a whisper. "Please fuck me. Please?"

"Now that was asking nicely." Justin slid forward into his little sister, slowly, kept going as he felt her resistance, not stopping until he couldn't move forward any farther.

"Oh... oh my god." Alex's hands clutched at the sheets, then she clamped her mouth shut hard to keep from making too much noise. Justin began to move back and forth in her, and she felt so good around him he moaned.

After a moment, he said, "Are you okay?" She nodded, and he kissed her gently, then harder, continuing to move in her. "Mmmm... we're going to have to do this a lot, Alex. It's feeling really, really good. I hope it'll feel this good for you next time..."

"It doesn't matter... as long as you keep giving me good spankings." She paused, smiled. "I love you," she said then.

"I --" Justin started to answer, but Alex giggled and cut him off by kissing him.

"I know. Rule four."

End.