My DS STILL loves my boobies and he is 25 months. I stopped breast feeding him at the age of 1 and he still sucked on my boob for comfort even after I had no milk.
Up until my DS2 was born he would just pop his hand down my top and play with my nipple.
He would even try to pull it out when we were shopping or out somewhere.
When my DS2 was born and I was holding both of them he quickly put his hand down my top to let me know he still had rights on my boobs.
Since BF my new born he has settled down finally and understands his baby brother needs mummies boobies for food.
So for us it took a long while.
I hope it settles down a lot quicker for you though.