...and there was never any going back...

I'm married with a family, but last week I crossed the line with my favorite student. She's in her twenties now, and we both knew it was wrong from the start. But one night at a teacher-student mixer, it just happened ... Her body pressed against mine as our lips met, tongues dancing together... We ended up in a dark corner of the room, hands exploring, clothes coming off... Fingers slipping inside her, teasing, stretching... Our breaths mingling as I entered her from behind, slowly at first, then faster... She cried out my name over and over again... It was intense and raw and so wrong. Should something like this ever be repeated? Am I sick for wanting it to happen again?