(This is a custom clip and I can make one for you too! Just send me a DM!!) The premise is that, thanks to modern science, the effects of taboo love have been nullified. So, you (playing both the mother and sister) pull your son/brother into another room, first focusing on the mother. No foreplay, saying you're too horny and can't wait to have a taboo babe with your son, you shove his dick inside. Talking non-stop about how you made that cock, he's fucking the same pussy that gave birth to him, ready to knock up the pussy he came from, etc. Also please mention how you’re fully -related, you are family, etc. One thing though, I'd like mentions that he's giving himself a sibling, how he's making a sister-daughter inside his mom's womb. Talk about how it'll be so amazing to carry your own grand; his sister-daughter (I want at least a few mentions of that term). He cums inside you as you orgasm, talking about carrying a taboo babe. Then, immediately after pulling out, the sister comes over (once again, played by you as well). She takes Mom's place, immediately starting to fuck. "You really just put my sister-niece inside of mom, huh? I really hope you have more of that family cum, because I want a daughter-niece. Come on, have taboo sex with your sister as well!" "I can still feel mom's pussy juice on your cock, you know. Such a pervert, fucking multiple family members at once." Plenty of talk about your own brother being inside you, how you have the exact same DNA, fully -related, yet are still making a babe. Once again, plenty of mentions of taboo sex. Perhaps mentioning how your daughter-niece and sister-niece can be close friends, and fuck the cock that made them. "But before all that, we have to make that taboo babe. So do it! Cum inside your sister! I want my own brother to have taboo sex with me, just like he did to mom!" Also, for both mom and sister, if you could use fake cum to show the afterglow for just a few seconds that'd be amazing. Lots of taboo talk, sister-daughter daughter-niece, etc. Lots of family talk.