Doujinshi with title Majime Osananajimi ga P Katsu ni Dohamari Shite Sex Daisuki ni Naccahu Hanashi and alternative title The story of a serious childhood friend who becomes deeply involved in 'P-services' and ends up addicted to sex | 真面目幼馴染がP活にドハマりしてセックス大好きになっちゃう話