Breastfeeding explanation for an older (bonus) sibling?

Looking for suggestions on how to go about explaining/introducing to an 8 year old bonus daughter (who we have full time) breastfeeding. I’ll be having baby sister pretty soon and want to be prepared, as she’s never been around someone who breastfeeds and honestly neither have I. -I have mentioned that it’s normal for babies to get milk from mom’s breasts or milk from a bottle and both are normal. I also compared it to the animals, as she has been around for our dog having puppies and them nursing.

She hasn’t said gross or anything to that nature but I’m more so nervous about her going to school and mentioning it like we all know kids do. Or when she has her visit with her Mother, mentioning it to her and it getting distorted..