My boyfriend is a cuckold: I give oral sex to my stepbrother

My boyfriend thinks I'm a virgin, but he doesn't know he's a cuckold, because my stepbrother has fucked my small, wet pussy, my big tits and my big ass. On this occasion my stepbrother asks me to relieve his stress with a delicious oral sex and I oblige him, he enjoys it so much that he rewards me by giving me all his hot semen in my small mouth and I am happy, I swallow it all. I don't leave a single drop, this is a secret between my stepbrother and me, and my cuckold boyfriend may never find out that I'm a horny whore.