But if you are my sister's boyfriend! what are you doing? My brother in law fucks me in the hammock

I have sex in the hammock! With the little sister! of my girlfriend! WTF... She squirts. I can't stand the urge and I fuck my brother-in-law, I know he wants to, but we're almost never alone, today I'll be alone with him, on my parents' farm. I hope my brother-in-law takes away how horny I am