Yaoi/ shounen ai / BL Isekai

Reverse Isekai. An unfortunate Omega Isekaied in a modern world without 2nd gender. Then he met a man who could relieve his pain.

Meek but not pushover Omega MC (WARNING MPREG) x Kuudere modern CEO ML (lots of character dvpt on his part. His doubt about MC at the beginning are understandable thought imo) + ML adopted son (adorable n sensible). Journey about them slowly learning what true family means. Not exactly my usual type of plot, but decent read still