Your Sister Anna invites you last minute on a spa weekend. You are not thrilled but agree as her husband pulled out last minute. She seems sad, she confides that she cant get pregnant and things are rough with her husband. Even though you are trying to be supportive, you cant stop staring at her curves in the bikini and her tits bubbling away in the jacuzzi. Maybe your girlfriend was right, you both are weridly close. Anna notices your hard on and taunts you. Your storm off trying to conceal your bulge from everyone else. Later that night, Anna is in the bath, you tell her that your girlfriend did not want you coming as she thinks you both flirt together. Anna is shocked and starts complaining about your girlfriends. As you hear her saying she doesnt know whats shes talking about bro.... Your cock stiffens AGAIN. This time, Anna does not laugh, she asks to see it, she takes it in her mouth and you cover your own sister with the biggest load you have made in years. That evening whilst getting ready for bed, you both try to make sense of what happened. However, the words turn to awkward silences and your face ends up deep in between her insatiable curves. Her pussy tastes so good. She begs to feel your cock and you thrust into her deep. She cums hard and climbs on top. She warns you you want cum as she's fertile, she edges you with her hips taunting you to hang on. You cant hang on any longer, you grab her tight, slam your cock deep inside her and empty your seed inside her.