MD added me on Snapchat. What to do?

Hi all, female monkey here. Started a few months back at one of the top Rx groups on the street (think Miller Buckfire/PJT). A few weeks back, my MD sent me an email with a QR code to add him on Snapchat. Interestingly enough, his Snapchat username was under the alias "big money large piece". I ended up adding him to avoid any awkward interaction and he now snaps me multiple times a day. He usually starts the day with a picture of him in his bed with something along the lines of "wish you were here baby" or "dreamed about you last night" in text. He acts completely normal otherwise throughout the day and hasn't hinted about our online relationship in person. He's a very awkward-looking hambeast and I have no interest in pursuing a relationship with him romantically. How do I go about dealing with this situation? Should I tell HR or talk to the MD directly? Any advice is appreciated