It's been a hot second sense I did an a/b/o prompt so here's one. This one actually involves 2 ships, so here's the suggestions for them both!
-Daisuga+Asanoya
-Levyaku+Kugushiba
-Bokuaka+Kuroken
-Ushiten+Kogagoshi
-Iwaoi+Kyouhaba
-Kamaniwa+Aofuta
-Semishira+Kawagata

Honestly I have even more combos if you wanna see them

One day there is an announcement, one couple (for my suggestions, the first one in this case) happens to be expecting. Eventually, as the first omega gets father along, the alphas asks the the other couple (second one) to watch him to make sure he's okay. The omega of the second couple is very interested and asks the other what it's like. Fats forward to the moment of the birth and the the omega gets a chance to see the baby and they're pretty happy but quiet on the drive home. The next day at breakfast, the omega is still hasn't said much 'Are you okay? You've been quiet-' 'I want a baby' and the alpha just spits out the coffee or whatever he was drinking.