HELP: Almost got caught drinking coworker's breast milk

For some context, I work at a medium-ish family office in the Pacific NW (this is important later on).

I sneak sips of my coworker's breast milk from the lunch room fridge.

She just had a baby a couple months ago and will pump milk on her breaks at work in the bathroom, then put her milk in the refrigerator at work in the lunch room. 

I take my lunch later than everyone else just to be alone in the lunch room and take a sip or two of her sweet breast milk, after quickly pouring it into my protein shake I bring to work. Thankfully there are no cameras and I have never been caught. I've had a breast/lactation kink as long as I can remember and I know this is wrong and probably illegal but it turns me on so much.

I also know that if I get caught I will lose everything. I never intended to do this but I had to take lunch late one day, I opened the fridge and there it was. Just seeing it in the bottles made me so horny. I already thought she was super hot but pregnancy made her so much sexier. Her breasts, hips and ass all got thicker. I had to taste her milk. I couldn't stop myself. I quickly looked around and no one was in the lunchroom or coming down the long hall. I opened the bottle and took just a taste and it was so good. I got so aroused I immediately ran to the bathroom and jerked off with the taste of her sweet milk on my tongue. 

I've done this multiple times per week for over a month now. I know this is wrong but I can't stop myself. To make it worse, she suspects something because of how the milk level is always lower than she remembers, but rather than suspecting me, she suspects her family members who also work at the family office (some cousins, siblings, etc) as one of her step-brothers had mommy issues from a young age. While this takes the heat off me, it's currently making for a very tense and stressful work environment.