there are many lactating muvie with breastfeeding scene. here the series:
http://www.dmm.co.jp/mono/dvd/-/detail/=/cid=442wbw007/
http://www.dmm.co.jp/mono/dvd/-/detail/=/cid=442wbw005/
http://www.dmm.co.jp/mono/dvd/-/detail/=/cid=442wbw003/
http://www.dmm.co.jp/mono/dvd/-/detail/=/cid=442wbw001/