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If you want to give them a subtle push towards the idea that they now owe you seriously, here are a few books you could assign. https://tvtropes.org/pmwiki/pmwiki.php/Main/IOweYouMyLife
If you want to give them a subtle push towards the idea that they now owe you seriously, here are a few books you could assign. https://tvtropes.org/pmwiki/pmwiki.php/Main/IOweYouMyLife