http://www.mangago.zone/read-manga/fushidara_na_hanatsumi_otoko/mi/099e3966120641c6472c6cb93c8b6403_chapter-1/28/
He told him to call him big brother while he was grouping him
Major spoiler
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The stone is not broken. He uses it to show siwon the night of the party where siwon was the one to actually kiss him first but they dont go all the way. After seeing all that siwon is super embarrassed about the things that he said and then they do it.... the raws r out on lehizin. If anybody wants to read it pls go ahead and support the author
Tbh this is the kind of mother i will be in the future