Hatsukoi, Tokimeki Usuihon

Cheerleaders Hime and Itoha have recently become lovers. However, they are both sheltered girls who don't know the first thing about love. In a misguided attempt to be a better lover to Iroha, Hime takes the advice of her friend and uses... erotic doujin as a guide?! A yuri love comedy about two girls experiencing love using ero doujins!

(Source: AniList)