Try to process what you just did

Your squeals of elation ring out through the living room, at this point, you don't even care if the neighbors hear. The unyielding orgasm seems to last an eternity, your body writhing in bliss. Finally, Allen relents, releasing your sore nipple from his greedy grasp. He gives a deep sigh, his breath just as ragged as your own. "Happy birthday, Joy." You giggle, but it's a light, breathless sound.

"Holy shit, Allen!" You can't believe it, everything just happened so fast. Sure, you always sort of had a crush on your step-brother, but you never would have dreamed of this! Slowly, your sense of post-orgasmic bliss gives way to the reality of your situation. He didn't just fuck you, he cam inside! And you begged him to!

"Oh god, Allen, our parents are gonna freak!" you squeal, starting to panic. It's a legitimate fear, your mom and his dad always wanted you to get along like a real family, but they never wanted you to get this close! You struggle meekly for freedom, but your weary muscles refuse to obey, and Allen's cock is still quite hard, keeping you rooted in place.

Allen just chuckles, slowly shaking his head. "Don't try to tell me that you didn't love it."

Your cheeks burn a bright red in response. "It's not that, and you know it."

"I knew you'd like your presents." As if to prove his point, he slowly pulls that massive dildo out just a few inches, teasing the inner walls of your once tight tunnel.

You whimper softly, your ass clenching instinctively around the big fake dong, causing him to give another chuckle. "That's my girl." Slowly, he begins to pull himself free, taking his time to tease you. Reaching up, he lets his finger gently play with your golden locks. "Well then, I'd say your party's just about over, I hope you enjoyed it, Sis." Judging by his tone, Allen's ready to leave.