You can't help but be turned on by your older sister and her huge tits. You constantly fantasize about her and she's been catching on. She's annoyed at how clingy and nosy you are about her life. You know that she's been having sex with her boyfriend because you overheard them fucking in her room. When she goes to take a shower, you decide to snoop through her phone and discover photos of your sister sucking her boyfriend's cock. You instantly feel your own cock swell up and you get so hard thinking about your sister sucking you off, but you also feel jealous. Your sister catches you in her room and you ask her about the pictures and she's very angry, calling you a creep. She tells you she's had enough of your obsession with her. You threaten to tell Mom and Dad about the lewd pictures in her phone and she begs you to please not say anything. You say you will only keep it a secret if she sucks your cock like she did in those photos. She is very reluctant at first, saying that's gross and you are siblings. She eventually gives in. She's impressed by how big your cock is and goes from reluctant to a horny slut. She enjoys sucking her own brother's cock and admits she would rather suck yours than her boyfriend's. You tell her you want to cum on her face and she is reluctant, saying it will mess up her makeup but you remind her about the pictures and she angrily goes back to sucking your cock, telling you to hurry up. She begs for her brother's cum and you spray a huge load all over her face. She complains about the mess and says that this better stay a secret.