HasFreeTime: I want to say the artist is Koki. This wasn't on his Pixiv, but there's so many things he/she draws that ends up on obscure japanese oekakis to never be found.
Anonymous3: anyone know where to get that one of her in a full body bikini? been looking for it for ages, i used to have it but those pricks at ychan removed it and suspended by account.
Its puberty for...what ever she is.