You catch your sister watching bro/sis porn and she tells you to stay and watch it with her. You tell her that that porn doesn’t really happen and she makes a bet with you to convince you otherwise. You give in and she starts to give you a handjob. She gets you won’t even last 5min and she’s right! You spray cum all over her boobs. You see her the next day and you want double or nothing so she says she gets you won’t make it again. She gives you a blowjob winning the bet again. Now the next day you have to fuck her and blow your load inside of her. She’s proud of you as you fuck her and for finally giving into your true desires.