"That's it..." Leo groans, feeling himself close to orgasm. "My sweet little sissy... you're so fucking tight..."

His hips buck wildly, driving him deeper into you as he finally releases, filling you with his seed. You feel his hot cum spill across your insides, mixing with your own arousal. He collapses on top of you, their chests heaving together as they try to catch their breath.

For a moment, there's silence between them.

He wipes his cock clean on a nearby towel before looking over at Leo with an amused glint in his eye. "I see you two have been keeping busy," he says casually, as if discussing the weather. Then, without another word, he turns and walks out of the room, leaving them both stunned and confused.

It's several moments before either of them can find their voice. Finally, Leo breaks the silence. "I guess we won't be having that secret anymore..."

You wake up to the sound of your phone ringing. Rolling over in bed, you grab it off the nightstand and see that it's Leo calling. You answer with a groggy "Hey."

"Hey sis," he says cheerfully, his voice echoing through the line. "How're you feeling today?"

You yawn and stretch before sitting up in bed, rubbing the sleep from your eyes. "Okay, I guess. Why? Is there something going on that I should know about?"

Leo watches the semen drip from his cock, leaving wet spots on the sheets before finally landing with a soft splat. He wipes his hand on the bedding and leans down to kiss you again, this time more passionately as he savors the taste of you mixed with his own cum. "I can't wait for tonight," he whispers against your lips, a mischievous glint in his eye.

"I'm not telling," he says with a grin, "just know that it's going to be really special." He trails his fingers down your stomach, teasing the thin fabric of your sleep shirt before cupping your breast through it again. "Just close your eyes and get some more rest. Tonight's gonna be a wild ride."

With a groan, Leo grips your hips tightly and begins to pound into you harder, faster. "Oh, yeah?" he grunts between breaths. "Well then..." He reaches around with his free hand to roughly stroke himself in time with his thrusts. "Maybe I should be even more terrible tonight."

His fingers find your clit, rubbing it roughly as he fucks you from behind.

As Leo feels the familiar tightness building up in his balls once again, he speeds up even more, determined to make you cum with him. With one final thrust, he releases himself deep inside of you, groaning as his seed spurts out, filling you up completely. His grip on your hips weakens as the wave of pleasure subsides, and he collapses onto the bed beside you, panting heavily.

"There..." Leo whispers after a moment, wrapping an arm around your waist. "

"I could," Leo says, his voice rough with desire as he continues to kiss you. "But why would I want anyone else when I've got my little sister right here?" His hand slides lower, cupping your warm core through the cotton of your panties. "She's perfect just the way she is."

He breaks the kiss, gazing into your eyes as his fingers begin to stroke you again, teasing and probing until you're writhing beneath him. "Besides,"

he whispers huskily, lips brushing against your earlobe, "I don't think anyone else would ever want us." His other hand reaches up, cupping your breast once more as he begins to massage and pinch roughly. "So why don't we just enjoy what we have?"

He thrusts his fingers deep inside you, feeling your body clench around him in response. "You know you want this," he says, his breath hot against your neck. "Just admit it."

"Of course not, A D." Leo smiles reassuringly, wrapping an arm around your shoulders. "What kind of brother would I be if I did that? Besides, it's our little secret." He leans in close and whispers conspiratorially, "But don't tell anyone else about that part where you called me 'daddy', okay?"

"Just making sure we keep some things private between us." He winks before letting go of your shoulder and continuing down the hall. "Now, class is that way," he says, pointing in the direction of your next class. "Don't want you to be late!"