志貴が秋葉と結婚したら四季は二重の意味で義兄になるんだな～って思った話

If Shiki married Akiha, SHIKI would become his "gikei" twice over, eh... is the sort of scenario I was thinking of
[tn]The term used here can mean "brother-in-law," "step-brother," or "foster brother."