Nanasaki ga Boku to 1-nichijuu Sukebe Shite Kureru Hon

In this Amagami doujinshi, Ai Nanasaki and her senpai spend an entire day passionately having sex while she wears a school swimsuit. When they run out of condoms, Ai suggests using her anus instead, leading to an intense session of anal sex where she expresses her deep love for him. Later, the couple manages to find one last condom and resumes having vaginal sex. Exhausted but completely satisfied, they finish their day by watching fireworks together. As the night ends, they reaffirm their mutual desire to stay by each other's side forever.