Cheating On Wife While Pregnant

It's not that I'm not turned on by my wife's pregnant body, but she's just moody and as she gets bigger, I can't fuck her in the positions and with the degree of roughness that I like. We agreed before conceiving the baby that she'd give me head as needed while pregnant if we couldn't have sex as usual. We also agreed before marrying that she'd blow me while on her period. These are reasonable agreements for a man who wants to be monogamous and not cheat.

Since she hasn't been blowing me to make up for the lack of sex in these last few months of her pregnancy, I've gotten with a younger girl at work. She's 22 and just started with the company, so I am not only fucking her but mentoring her as well. She is fine that I am married and expecting a baby and she can't understand why my wife doesn't suck my dick every day, because she enjoys it so much. She will wink at me and lick her lips during business meetings, which is so distracting. More than once I've had a tent in my slacks and have had to find a way to make it less conspicuous while I was presenting. Then, right after the meeting, we meet in a supply closet and she blows me before I fuck her brains out.

I am not going to want to stop this after my wife gives birth.