Kyou Kara Omega ni Narimashita
4/5 Beta and alpha are childhood friends who have secretly loved each other from childhood. When in uni, the beta uke presents as an omega, and seme helps him out. When discussing with their mothers, the mothers decide they should become mates and the seme agrees. The seme then wants to give the uke some space so he can make a well thought out decision to become mates, and this leads to tension because the uke thinks he is taking advantage of seme's kindness and the seme thinks he is causing the uke more pain because as he presented late his heats are more unstable. After a few discussions with a senpai who also presented late and the uni doctor, they discuss their feels after the seme chases off a would be sexual assailant and they realise they have both loved each other for a while. Then they become mates properly and are very happy. Would have been 5 stars if they talked through their feelings sooner.
Totsugimasen Kara!