My cousin kissed me?

I've known my older cousin since I was a baby, but recently we've spent many years apart since seeing or talking to each other. Im now 19 and he's 22 This summer I've been staying at my aunt's place (his mum), so we've been hanging out a lot, he would often check me out and tease me but I didn't think anything of it at first.
The other day we got drunk together and he kissed me, I pushed him away and he said, sorry I just thought you looked so beautiful. I didn't want to make a big deal out of it so I laughed it off and said he's crazy. But now he's being even more touchy and he knows this is taboo because he tries to look completely innocent in front of my aunt. Yes he is good looking but just imagening myself with him makes me cringe, I feel weirded out by him touching me. And I still have a few weeks left to stay here and I don't want to make things incredibly awkward for us this whole time that I'll be here.
What do I do?

Also is it common to crush on their cousin?
My cousin kissed me?
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