Ookami-san Ka no Shiwase Keikaku

The Omegaverse of doting beastmen! "I thought heat wouldn't come once we became mates..." Satoshi is a beautiful and devoted omega who has been in love with his childhood friend and favorite alpha. Satoru, a beautiful and devoted omega, marries his childhood friend and favorite alpha wolf beastman, Kai, and becomes his mate. Three years latern, they are spending happy days with a cute baby born to their loving husband and wife, who are growing even deeper in love. Then one day, Satoshi suddenly gets heat...? (Source: Media Soft, translated)