I'm not new to sex or whatever, but hooking up is pretty emotionally... conflicting? Taxing? Dunno the word. I'm not obsessed or worried, but I don't know what to really feel or expect in the future. I don't have any reference point anymore.
At least the ass was fat.
Don't overthink it. The more time you spend into convincing yourself that you're simplifying it, the more you are doing the opposite, go with the flow. If you end up getting emotionally attached, no worries, have a few sleepless nights, don't close yourself up and it doesn't matter.
It is as if though the best advice is to run from any sort of "emotional obligation", and that's not the case. Experience it and figure out how are you going to approach it in the future. Maybe getting emotionally involved (whatever that means to you) is what you really need right now (you are craving for that experience or that feeling or whatever), get involved, be happy, be sad and move on.