Cheating Step Mom Blackmailed

My step son is so lazy, making me clear up after him whilst his dad is at work. I’ve had enough! I’m telling my husband that his son has to go!! But my step son has evidence of me cheating and threatens to eat me out…. unless I suck and fuck hun like I have been doing with my lover. I have no choice but to give him what he wants! I just hope my husband doesn’t come home early and catch us!!!!!!