Hey all!

For background, I (F20s sub) am new to kink and have recently been trying to get out there in my local kink scene and find play partners to casually do scenes with. Mainly looking for FWB situations (which I've been pretty clear about). I am talking to a couple doms and one in particular (M20s) I will be doing a scene with in a few days. I feel very comfortable about things with that dom (we have discussed and negotiated at length, done some light play and some dirty chatting, all that responsible stuff).

Really I've been talking to him for a bit over 3 weeks, and doing any sort of dynamic play for about 2 weeks (not very heavy until recently). When discussing aftercare over text, he mentioned checking in on me afterwards (like the day after). I told him that I would appreciate that a lot, and his response was, "Of course, I’m your dom so I will take care of you."

My immediate reaction to this was that he jumped to "your dom" very quickly for me. I recently got out of an emotionally abusive relationship where my partner (a dom) used his "ownership" of me and my attachment to him to coerce me, so I've been careful about getting too attached to potential partners. Plus, he knows I am talking to other doms and am looking for something casual and not monagamous. I didn't say anything about it because he shifted topics quickly to planning the logistics of the scene, and I didn't know if my feelings were reasonable. I don't want to nitpick on something that potentially all in my head and make him anxious about things. We are both fairly inexperienced, but he's been in the scene longer and has more practical knowledge.

I suppose my question is: are my feelings reasonable? I am so new to all of this that I'm not actually sure if it's common for casual play partners to refer to each other as "my dom/sub" or "your dom/sub" as opposed to "a dom/sub I play with" or "a play partner." Is saying "I'm your dom" adjacent to collaring, or is that just a misunderstanding I have of how these dynamics work?

I'm also stressed about the timing of a potential convo about this. I don't want to say anything that would make him nervous about the scene (which we are both excited about). Until that day, we both have very busy schedules as well so I'm not sure if I at least would have the emotional capacity or time to have as in depth of a discussion as I would like to. On the other hand, I don't want him to think I've been ruminating on this for a while if I wait (because even though I have been, it's not his fault at all... the timing is just unfortunate). Once again my fear is just that this isn't actually a big deal and I'm splitting hairs over semantics. Do I just let it go?

Please advise, friends!

Edit: thank you all for the advice! It's given me a lot to think about!