Sound advice from my dad: don't dip your pen in the company ink well.
Managing in an office wherein there is an interoffice romance going is quite an adventure too. A married guy who worked for me had a romance with someone in a neighboring office who was also married. He used to brag about it often. I took him aside and pointed out that his paramour was married to a hot head. I told him I did not want to catch a round meant for him at work from his paramour’s husband. I said if the thought of that did not deter him, consider he had a $750K house which he would surely lose as he and his wife had 3 teenagers at home and since he was close to retirement, half his pension. The big head won out, he stopped the affair.