fingering myself as i breast feed

This is true.

I am in an age where some former classmates/friends etc. have children, and most of them experience the feeding of their child as a sexual turn-on.

Now, for the fingering part: I'm very sorry, but i don't really think it's all that wrong. Technically, you shouldn't "hide" anything from small children. Neither you going to the toilet nor your genitalia. Now, i understand the usual consensus for children sleeping in their parents bedroom is that sex only happens AFTER the child fell asleep(they will normally not wake up from that, btw), but other sources claim that even active sexuality does not need to be hidden from babies. After all, it's a "natural" thing, not actually something that is not normal. I know our society likes to believe that anything sexual will irreversibly traumatize our children, no matter how young or old...but i can't agree to that.

Now, wether it's actually acceptable or not? I can't really say, but i think it's not totally morally wrong(rather in a grey area) unless you specifically feed the child for the express purpose(that would be abuse).