Sometimes you just want to read a book about a Toppy Top and the Bottom who loves him. Please limit the list to couples with strict top/bottom roles.

This means the top only tops and the bottom only bottoms. This is relationship specific, so it doesn't matter what the characters do before they meet. For series where couples start out with strict roles and then become more versatile in later books, include the books they are not versatile if the books can be read as stand alones.