Looking for manga - Frustrated gf

A high school romance. Lead character is a shy cute girl with a slender body and shoulder length hair. Her bf thinks she doesn't like it when he's rough but that's not the case. Fl has a talk about blowjobs with her sister and decides to give her bf one. She does so and they clear up the misunderstandings and have the perfect vanilla sex. (It could be in an anthology, not sure) Thanks already!

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