Owned by my boss, boyfriend has no idea

I'm a 19 year old female and I've been with my boyfriend since we where 14. I first cheated on my bf in high-school with a guy who had a dick a big bigger than my boyfriend. He made me cum so much easier and harder than my bf. After fucking him a few more times, he said it was because he was bigger. So after that I decided to go hunting for bigger and bigger cock.

I got drunk one night on a works night and was chatting to the cute guy at work about my love of big cocks, he showed me a selfie of his, fuck me it was crazy big, I had to try it. I fucked him that night, and the sex was just mind blowing, literally the best I've ever had, but he introduced me to a seriously dominant and controlling ownership. Im not usually very submissive, but I didn't even question his ownership. I know he fucks other girls from work and on nights out, but honestly I don't care, I love his cock and I can't bare the thought on losing it.

I'm still with my bf, and he is completely unaware. I was going to break up with him but my master told me not to as he prefers me cheating. I've done the usual of fucking or giving head while on the phone. Blowjob in the car to say thanks for a lift home. Not sure what else to try that my excite my master