Update:
Wasn't a chance for a private moment at lunch. We were too busy, work wise, to get a moment alone. I had to leave to check on a hold up at our supply depot. While I'm out I get some IM messages. Most of them about my progress, but a few flirty ones too. Sent me a couple pictures. One off her cleavage looking down her blouse and an upskirt pic showing she had no panties on. When I straighten out things at the depot and get back in my truck, I work up a good hard on and send her a pic back. She quickly replies "Don't jerk off! I want that jizz in my mouth" along side a devil emoji.
Stayed serious the rest of the day. Worked late and got our project back on track. The staff stayed behind as well. Didn't want to work over the weekend. I wait on the break room couch, making use of the pics she sent me, while she sees the last one out. She comes in "Well that's the last of... didn't I tell you not to jerk off?" She slaps my hand away "This is my job." I shrug "Just warming it up for you." and she goes to work.
There is not a surface in that break room that didn't have her ass on it at some point. We end up back on the couch. Spoon and talk for a while. What each other is doing over the weekend. That sort of thing. We get dressed, reassemble the break room, and then make out a bit more before leaving. Could still taste my cum on her lips.
I wasn't sure about this. I'm still not TBH. Work isn't suffering, still able to be professional in the office, not even a distraction really. Maybe that will change, address that if/when it happens, but for now it's all good. Riding a good high here.