You can see that something is wrong with your sister through the slit of the door but your husband tells you not to come in, that he's taking care of her. But you're really worried, is she okay? Is she sick? Why is she whimpering and moaning like that? Did she hurt herself? Why is he grunting and breathing heavily? Is he trying to hold her weight so she doesn't fall?
She starts to talking to you through the door.
"It's okay… I'm okay. Your husband's- uh- taking good care of me… mmm, fuckk, oooh. Your husband- he's, ohh, Got me. I.. mmm. he, just.. oooh, don't come in. until… I, Fuck. I.. cum..Oh! Uugh, I. Come out. It's okay, sweetie, he's taking care of me! "
"Okay, if you're sure.." You start to walk away when you suddenly stop. You don't know about this, your stomach is in knots, she's saying she's okay but she's obviously hurt. You hover, wringing your hands, not knowing what to do, when your thoughts get interrupted by your husband's voice.
"Oh fuck. That was the.. uugh, hottest thing.. ever. You're such a flithy little whore, aren't you? Fucking loved, uhh, hearing you speak to my stupid wife. Uh. While... my hard cock is throbbing in your tight, dripping pussy. Now, fuck, I'm going to fill your evil little cunt with my married cum. You would like that, wouldn't you, you filthy whore. Beg for it, you slut. Beg for your sisters husband to splatter his married cum in your womb. Beg for your brother-in-law to breed you like the needy little cumslut that you are, while your sister listens in."
No... No no no. You must have heard wrong. You definitely heard wrong. You shake your head, no, definitely not. He's just helping her. He said he was just helping her! He wouldn't do that to you, your baby sister definitely wouldn't either! No, you're just tired. You've been up since 4am, making sure her birthday party goes well, you're bound to be tired. Yes, exactly! You smile and nod to yourself, you're definitely imaging things! You walk away, happy that you came to this decision.