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Harem Building Trope
A storyline where one protagonist (often male, but not always) gradually accumulates multiple romantic and/or sexual partners, all of whom are aware of and consent to their shared arrangement with the hero or heroine.
Why readers love it
Readers enjoy the power fantasy of being the center of attention from multiple desirable partners, plus the satisfying group dynamics as the harem members bond with each other and negotiate jealousy into a supportive family unit.
Also called
Reverse harem
polyamorous harem
dark harem
accidental harem
harem as found family