@Cocorin 16 is located here https://e-hentai.org/g/179388/1a060cc9f5/?p=3 as number 160 the artist is "shiina kazuki" the group occasionally tagged along with that artist is "doku pepper"
@Glagan: Nr 8 is from https://e-hentai.org/g/496052/68a3715998/ and Nr 14 is from the artist Zion but you can't find the doujin here. Try this http://www.anime-sharing.com/forum/hentai-doujinshi-34/japanese-c81-%5B%E3%81%95%E3%81%8F%E3%82%89%E5%BA%AB-zion-%5D-%E3%81%B1%E3%81%A1%E3%82%85%E3%82%8A%E3%83%BC%E3%82%92%E3%83%A0%E3%83%8B%E3%83%A0%E3%83%8B%E3%81%99%E3%82%8B%E6%9C%AC-%E6%9D%B1%E6%96%B9-114389/