<human>: Can you condense the text into three sentences or less?

I'm [M24] in a great relationship with my gf [f26], 3 months. Emotionally connected, sex is great, etc. However I was teasing her last night about something (it was so trivial I forgot) and she (I *THINK*) half jokingly responds, "No sex for you!". In my head I screamed, "WOAH", because this is the second time she's said this. Previously shes said it but has not brought it up or used it against me, and there has been a lot of sexy time in between then. Of course the concern is that she might WILL use it one day against me. Am I making a big deal out of this? If I am NOT, how do I bring this up to her?

A few background infos: I am her first real relationship (she's a late bloomer). So far she has been very aiming to please (me).
<bot>: SO (probably) jokingly threatened to withhold sex. Didn't make a big deal on the outside but I know what could *potentially* be a red flag in the future.