Fics like two red lines

Lately, Kiyoomi notices some changes in Atsumu - his scent, diet, stamina, and the lines of his abs - but he tries to push back his suspicions because Atsumu doesn't experience any morning sickness. One late heat cycle affirms Atsumu's condition, which will change their lives soon enough. (or: scenes of atsumu's journey in pregnancy and kiyoomi being whipped)

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