Title: Starting a Family with My Silly Omega
Haruto Yotsuba is an omega, and, as it turns out, his childhood friend is an alpha named Souta Asahi. The two have had a sexual relationship for a while now, under the guise that all omegas have to be intimate with alphas to reach adulthood safely. But unbeknownst to Haruto, this is all a lie. Souta has loved Haruto since they were children, and he has no intention of letting anyone else have him. So, Souta took advantage of Haruto's innocence and laid claim over him with his body.
But no matter how ignorant Haruto is, he won't fall for this trick forever, and with other suitors waiting in the wings, Souta has to work fast to ensure that his silly omega stays his.