u/Spiritual_Being_3786

If i remember correctly it was an original , not a parody and she had short hair (purple or blue on the colored cover i think) . She was wearing a swimsuit and leading a swimming class . She had big boobs , big ass (possible bbw and teacher) and she was having group sex at some point i think. Could not find it anywhere on nhentai , although i remember seeing it there.

Edit : Solved , it's AroThir Dokushin Josei Kyoushi wa Shishunki Danshi Nanka yori Tamatten da yo! By— Shittori Bouzu.