Well lets see, there are plenty of manga that end with the couples getting married and even some with the pregnant end. Some of the best of vanilla epilogues i can think of off the top of my head are: Call and Response, Believe Machine Ch. 4 (really sweet and heartwarming), Yanagida-kun to Mizuno-san Chp. 21, Lamia of Love (monster girl), 1LDK. There are more I'm sure but those are some of my favorites