Quick disclaimer, I do not condone fucking anyone in your ACTUAL family. I just feel the need to clarify that these are horny kink fantasies, and I do not support irl incest in any way.

Its so hot and A/C is only barely working. You go to lay on couch with your sister while she's watching TV. You try to start a conversation with her but she ignores you. You look at her and realize she's bottomless, only in her panties. You honestly wouldn't even bat an eye if her huge cock wasn't poking out so temptingly. You look around to make sure your parents aren't home before sliding closer to her. She doesn't notice, or doesn't care. Your right next her, she smells so strong. You lean in for a sniff, she doesn't notice or doesn't care. You wonder how far she'll let you go. You lean in and kiss the tip of her cock. She doesn't notice, or doesn't care. You rub her cock through her panties. You hear her take a deep sigh and stop. You feel like that's probably enough for now until you realize she's removing her panties. She tosses then aside and you notice a slight smirk on her face. She still didn't acknowledge your existence but her throbbing, leaking cock is all the invitation you need. You stroke your sister before being unable to resist sucking her cock. She tastes so good. So sweaty and strong. You keep sucking, you want her to cum so bad. You can feel she's close, you open your mouth and prepare for her to make a mess of you. Suddenly your sister pulls you away and stops you, you look at her confused. She's panting heavily and sweating. She leans in and whispers in your ear, "If I'm gonna cum, its gonna be inside you" she walks to her room not so subtly implying for you to follow. Your face is completely red, but, like the obedient little sister you are, you follow.