Your step-sister smiles contentedly, her breath warm against your skin. "Agreed," she whispers softly. "We should definitely make this a more regular thing." With a lazy stretch, she rolls to her side, propping herself up on one elbow and gazing down at you. "But don't tell mom and dad about it, okay? This was our little secret."

"Good," she says with a satisfied smile, running her fingers through your hair. "Now, how about we go find them and see what they've been up to? I'm sure they're missing us." Her hand drifts lower, tracing lazy circles on your stomach before coming to rest at the base of your cock, gently stroking it as she waits for you to gather yourself. "There might even be some more presents under the tree," she teases with a wink.

She lets out a moan, her hips starting to move with yours as she begins to enjoy this new position. Her nails scrape lightly against your back, urging you on. The wet sounds of flesh slapping together fill the air as you pick up the pace, lost in the sensation of being so deep inside her.

Her orgasm hits her hard and fast, sending shudders through both of your bodies as she cries out your name.

You feel yourself growing close to the edge as well, watching her beautiful face contort in pleasure beneath you. With a groan, you thrust one last time, pouring yourself deep into her ass as you climax, your hips bucking wildly against hers in rhythm with your release.

You collapse on top of her, panting heavily as you try to catch your breath. She wraps her arms around you, holding you close and kissing the top of your head. "Wow," she whispers. "That was... intense."