http://myreadingmanga.info/tag/mpregmale-pregnancy/

That is a reading sight. It has a few M-preg stories some originals others doushinjis.

Okay, So I'll just suggest a few things that haven't been given out yet. I dunno how to put the url here so please forgive me.

Mauri to Ryuu-the 1st chapter showed a dragon having a child with a male human. It was sweet and romantic. The pregnancy wasn't shown but they definitely had a child. This is one of the nicest mpreg stories I've ever encountered.

Sex Titans-this is a Shingeki no Titan dj that's a parody of Sex pistols. It has 3 chapters. No actual pregnancy was shown but chapter 3 came pretty darn close.

Shota Pregnancy-This is basically about 2 shotas that were raped by a god. To avoid bringing bad luck to their village they have to give birth to the god's children. There's a minor twist about the birthing here so keep an open mind. (WARNING: EXPLICIT; PWP) 🤣

Kureta no Meushi-Greek man raped by a half-man/half-bull. The art's not for everyone since it shows manly men but if you run out of mpreg stories then give this a try. (WARNING: EXPLICIT; PWP; BARA)

Saka no Ue no Mahoutsukai-this is about a wizard who gave birth to a boy. The wizard explicitly said that the boy came from his anus. How much more bluntness do you want. There are only a few chapters that are scantalated but it seems interesting. There are a few points and technicalities about the boy being his actually son but it is undeniable that the boy came from his body.

I guess that's all I have.