@LANthus
Marisa is only the lead in pairings with her and Reimu because she loves teasing the shrine maiden and getting that ice cold facade to crack despite her best efforts to play it cool. And books that she's stealing^H^H^H finding.
@Nine exactly.
@LANthus
Meanwhile Reimu shuts off her heart because she's worried about today's lover becoming tomorrow's prey... But if ever unleashed she will devote her life and all her being to her loves... But she's also poly as fuck so... It manifests as this overwhelming desire to protect all of Gensokyo. previous bosses become playable characters due to her love of them thusly. :D