Conflicted Desire and Pleasure

I just got separated from my wife of ten years. We were both feeling it wasn't working out anymore, but the divorce hasn't been final yet. A week ago, I met a grad student in one of my classes who is incredibly intelligent and has this wild side that's so different from my usual crowd. She's twenty-five and she just gets me in a way no one else ever did. We were at a party last night where things got heated between us, with the alcohol flowing and our inhibitions lowered. I had wanted to explore something taboo but consensual, playing out a scenario of being caught by surprise, tied up and explored thoroughly. She agreed and we moved to an empty room. There she blindfolded me, her hands skilled and sure as they tied my wrists above my head, the ropes cutting into my skin just enough to make it thrilling yet safe. My heart was racing as I heard her unzip herself, the fabric whispering against her body. She climbed onto the bed and straddled me, pressing her wet warmth right against where I ached for her. Her fingers slipped inside of me, finding that spot that makes my knees buckle with desire. She worked me until I was quivering beneath her, her lips moving to suck at my neck, leaving marks as she tasted my skin. As she rode me hard and fast, my body was on fire, every thrust driving us both towards an edge we couldn't resist anymore. We came together in a blinding rush of sensation, collapsing into each other afterward with our hearts pounding. I can’t help but wonder if this is normal or just something to feel guilty about.