Nelvimar, dominatrix in charge, commands Franki to undress while she watches, appreciating her sister's body. Franki's hard, throbbing cock stands at attention. Nelvimar, in control, guides Franki's thick, uncut cock into her tight, eager pussy. She rides him, her hips grinding, her tits bouncing. Franki, overwhelmed, grabs Nelvimar's ass, pushing her down harder, deeper. Nelvimar, dominant, slaps his hand away, "Solo mis reglas, hermanastro." They fuck passionately, their bodies slapping together, until Nelvimar screams her release, Franki following soon after, his hot cum filling her.