It feels completely natural as that’s what our breasts are for! Like the above lady has said, you won’t feel those thoughts when baby latches on! I loved BF with my son and so can’t wait to do it again with baby no.2
I had a very painful experience with my first due to poor latch and it took us weeks to fix it so it never crossed my mind in such a way. Once we got it sorted it was one of the most pleasant experiences to see your little one calming down and falling asleep in a "milk coma" babies would have this blissful smile. It really has a huge part in the bonding.
Hey trust me you won’t feel these thoughts once baby latches on, I thought the same as you but it’s a completely different feeling then in a sexual way, doesn’t feel nice at all lol , don’t overthink it 😂