Urges for my brother :/

For the past few months me and my brother have become very close, ever since he came back from uni. We hang around alot, at home and at bars etc. The other night when we were both quite drunk i had some unusual feelings towards him ... i wouldnt say they too bad but at one point i wanted to kiss him .. i think these feelings have passed but im worried they will come back next tiem were both drunk. is this normal? :S Nick x