HP: The Head of the Family Has Run Off with the Potions Master Again!

This book is also known as "The Patriarch Who Likes Galleons Ran Away with the Potions Master Again" and features two male protagonists.

Severus Snape x Sirod Slytherin (with personal interpretations)

The isolated and helpless potions professor finally met his little rose, a story of black and white intertwining, confusion and fusion.

Upon entering school again, Sirod winked at Severus.

Severus: ...

Later, Sylvie asked, "Professor, do you believe in love at first sight?" while grabbing Severus's sleeve.

(There are parents and children. They are Tom's classmates. They don't like idiots and like Galleon. Severus will not like Lily and will only like Sir Lord.) (You can skip this if you don't like it.)