The Grad Student's Unexpected Surprise

So I've been dating this guy named Alex for the past few weeks. We both go to uni and have been seeing each other casually, nothing serious, no labels or anything like that. It’s been going well enough, but there hasn't been any sex between us yet. Last night, we were hanging out at my place watching a movie and drinking wine, just being chill. As the night went on, Alex seemed to loosen up more and started making subtle come-ons, leaning in close to whisper jokes in my ear, brushing against me whenever I moved past him, that sort of thing. It was pretty clear what he wanted by the time we finished the movie. So after turning off the lights, we kissed for a bit on the couch and ended up moving towards the bedroom. That's when things got weird. Alex had this intense look in his eyes, like he wasn't just looking to hook up but was really craving something more. As I pulled back slightly to gauge if he wanted me to stop or not, he grabbed my hips tightly and kissed me deeper, moving down to my neck. I consented every step of the way, there's no question about that, but it was clear this wasn't just casual fun for him. He was really going at it, biting down gently but firmly on my shoulder as we got undressed, his hands exploring with a feverish urgency I hadn’t seen from him before. When we were both naked and he entered me, I'll be direct here, there was an intensity that felt almost possessive or needy. Not rough or aggressive, just desperate and hungry in a way that surprised even me. His body moved against mine with a rawness that left no room for pretense; his grunts and gasps were as visceral as the way he touched me. It wasn't exactly what I expected from a casual hookup but it was hot, really hot, probably one of the hottest experiences I've had just because there was such an overwhelming sense of need from him. After we came, both breathing heavily on top of each other, Alex pulled back slightly and looked at me with these deep blue eyes full of something that felt like more than desire, it was a bit unsettling actually. But it’s not like I’m complaining or anything; if this is what comes out of hanging around the house together late night drinking and watching movies, who am I to say no? It's just an interesting shift from how things usually play out between us. Maybe next time we'll talk about boundaries more, but honestly, that wasn't needed in the moment. Anyway, I’m rambling now but that’s what happened last night. Any advice or thoughts on this kind of unexpected intensity would be appreciated, I'm just processing it all myself right now.