Caught Me Off Guard

I never thought I'd find myself getting turned on by my colleague at school. But there we were, in the break room after a long day of teaching, and she was all dressed up like she had somewhere to go. She leaned over me as I reached for my coffee, her cleavage practically spilling out of that tight top. It was a surprise when she kissed me right then and there, her tongue slipping into my mouth and hands sliding down to cup my ass cheeks. I moaned into the kiss, feeling how hard my pants were getting against the tile floor as I pressed back against her. We had to pull apart because of the cough from another teacher walking in, but we both knew what was coming next. She whispered for me to come over later when no one would be around and I agreed without hesitation. That night, we got it on at my house after a quick drink at a bar downtown. There's just something about knowing how our students would react if they found out that makes everything hotter. But now I'm wondering, is this normal for married folks? Should I be worried or am I just exploring what's out there?