It sounds like really, you're worried about whether your T is comfortable with your feelings or not. It's not really about the words, right? Maybe you ended up feeling a sense of rejection, or otherwise, some unknown personal meaning coming from him when he avoided the word "erotic."

Now it's got you thinking about it a lot, but remember--this is his thing, not yours. Feel free to ask him about it, but remember that his reaction wasn't something that you personally caused with your wording.