they're acting strange

I hooked up with this guy and he made it clear he was a Dom, which is fine with me. I didn't know him that well but we still did it anyway. He went back to his college town which is 2 hours away but he's texting me like I'm his personal Sub and that I'll listen to whatever he says like sending him pictures. I said maybe later but then he goes "but you're suppose to be submissive sexually 😏" He was cool/nice when we got together and all but it's kind of getting weird cuz we aren't dating or anything , but I don't want it to be like a Anastasia and Christian Grey type thing lmao. He's like 5 years older so am I being naive ? I don't wanna be anyones bitch even if I am submissive in bed