Ex-Student After Hours

Went to my office last week to grade papers late one night. A former student who I had this year for a class stopped by unexpectedly, saying he needed help on an assignment. We were alone in the building, and after talking about school stuff, he made me feel so comfortable, like old times when we'd joke around before lectures. But it quickly turned intimate as he leaned in close, kissing my neck. I tried to keep things professional but gave in, letting him touch me. Ended up taking off my clothes right there in my office and having quick, passionate sex on the desk. Never thought anything like that would happen again after divorce.