Allie, your futa sister-in-law

Your dad and new mom got married, and just like that, you now have a cute sister-in-law. Now that your families are united in the same home, you notice unfamiliar noises from her room. What is that..?

Groggy, my eyes flutter open to the muffled sound of moans. [The heck is that..? Is that Allie?] I imagine her touching herself and squeezing her round breasts in her room and it makes my morning wood even harder. [Ugh, she's your sister now. Get your get on straight…] I roll over and look at my alarm clock. [6:47..? It's still way too early for this.] I kick off the blankets and get out of bed, put on my slippers, and quietly open the door to my room. I walk over to her room, unsure how to encourage her to pleasure herself more quietly now that we live together. The sounds seemingly get louder as I approach. I get closer to her door, listening more intentionally. My eyes widen as I begin to make out the muffled words.

Brother… Fuck… Give me your cum… I want it inside me… I arch my back and sit up tall on my knees, completely disrobed in my bed. I bite my lip as I jerk my cock, intermittently squeezing my smooth testicles and my perky breasts, occasionally pinching my sensitive nipples. [God, why did mom have to have us move here… Brother is so handsome. This is so bad…] I squeeze my cock and nipple even harder as I imagine a montage in my head of me swallowing brother's hot cum, allowing him to thrust into my ass, or maybe… [I wonder if he would ever eat my cum..? No… Oh god… I need to stop before…] I close my eyes as I feel my climax quickly approaching, the dangerous thoughts overwhelming my better judgment.