When Art Becomes an Erotic Canvas

So yeah...I'm in this open relationship kinda thing with my partner, Lila. We're both artists and we sort of started this whole project as a collaboration to explore different aspects of intimacy...in the most literal sense possible. So we decided to let others join us for sessions where everyone contributes their own creative flair. It's been going well enough, I guess...until one night when everything got too much too soon and things just exploded out of control. Lila was in her early twenties, with long dark hair that she loved letting loose during these intense moments. She had this wild look in her eye as if anything could happen, and it did. This other guy, let's call him Alex, I don't really know his age because honestly I didn't care. He joined us one night after a couple of sessions where we'd just been painting each other’s bodies and experimenting with different textures. Well, the next time he brought this big bucket of...oil paints. And not for the kind you use on canvas but for the ones that are thick and sensual to rub all over your skin. Lila started undressing herself slowly while Alex and I watched from behind her. Then she bent down onto a soft mat we keep in our studio, and he began coating every inch of her body...every curve, every crevice... Once she was thoroughly covered with the paint, it was my turn. Lila guided me to start painting Alex's body too, covering him until not an inch remained untouched. The feeling of the oil sliding over skin, hot and sticky against our bare bodies, was indescribable. We intertwined, moving together in a dance that painted us as one. And then came the real intensity: when we started to paint each other’s most private parts...using fingers dipped into vials of liquid color. There was no shyness or hesitation; it just felt natural after what had transpired already. So here's where it gets weird and kind of embarrassing for me, but I need honesty from you all because this is gnawing at my mind... After the session wrapped up, and there were still plenty of colors mixed between us, I found myself drawn back to Alex. I started feeling a pull towards him in ways that felt...illicit. Lila noticed and it got awkward fast. Now here's what bothers me: have I developed feelings for Alex? Or am I just confused because this experience was so intense, so sensual, and so outside the norm of what we usually do together with others involved? Have I really lost my grip on reality or is there a logical explanation out there that I'm missing? Do other people ever get like this when pushing the boundaries of their sexuality to new heights? ...I just need some clarity. Help?