This addon is based off of the CovetousCountess addon.

It works just like it, except instead of the CovetousCountess quest, it only allows you to accept Spree Contracts from the Dark Brotherhood Marked for Death contract book and removes the possibility to accept the other single kill quests. Spree contracts are worth twice as much reputation so this allows you to level up your Dark Brotherhood skill line much faster.

The interact button (E by default) will immediately quit the quest dialog, if the quest is not a spree contract.
This means you'll only have to spam the E/Interact button until you receive this quest.

Note: This addon uses the quest offer text to detect which quest is currently offered. As a result languages others than English are not supported.