Doberman Kinshirei!

From mangaupdates.com: Shingo and Kippei are caught in a compromising situation in a hidden spot at school. Unfortunately, their hideout isn't as secret as they thought, as the student council members discover them. Homosexual behavior is strictly prohibited and can result in physical punishment—though not in the way you might be imagining. The student council leader, Sawatou, known as "Doberman," is tall, dark, handsome, and even wears a cape. Kippei is instantly smitten with him. However, given that Sawatou strongly disapproves of homosexuals, this newfound love seems destined for failure.