Caught Off Guard

I’ve been in an open relationship with my partner of five years, but it’s always just the two of us. Last week, a friend I haven’t seen in ages stopped by unexpectedly while I was home alone and we got to talking over drinks. Before I knew it, he was kissing me passionately, his hands exploring every inch of my body. I felt like jelly as he led me upstairs, his lips never leaving mine. He undid my pants and pushed them down just enough for me to feel his fingers sliding inside me. I couldn’t help but moan loudly, feeling the rough texture of his calloused hand rubbing circles against me. He pulled away briefly, his cock already hard against my thigh as he lined it up with my entrance and slid into me deep and quick. We moved together, my body wrapped around him, each thrust hitting a spot that made stars burst in front of my eyes. I’m so ashamed to admit it, but the way our lovemaking felt... It was like nothing with my partner ever could be again. Am I the only one who’s ever felt this conflicted? Is there something wrong with me?