Suieibu Shushou no Boyish Osananajimi wa Boku no Chinpo ni Dohamari Chuu

The school idol, the captain of the swimming team, or perhaps a perfect human being with both beauty and intelligence. There are many words to describe her, but they are all just superficial. The boyish beauty with big boobs who the whole school admires is my childhood friend, but her true nature is... a perverted girl who is obsessed with my dick. What kind of relationship will the two develop after these very immoral and lovey-dovey days? (source: Melonbooks translated)