Adult sister swallows my dick so I don't turn her in to her mom

"Sister, I'll let you play PS4, but eat my cum first."

She wants me to keep quiet for nothing. Am I stupid? She'll suck me off first

A blowjob and that's it?! You want me to keep a secret, spread your legs, sister

Is this blackmail? Fuck between my tits instead of a blowjob, they're big, bro

Bro, how about this: you touch my boobs, but don't tell your mom about porn?