Mpreg Central

Guys gets pregnant from an alien, first mpreg scene starts at 7:06
https://www.youtube.com/watch?v=IMGTUSXSgQw

Not an mpreg but he does get a cute little belly
https://www.youtube.com/watch?v=42_04JpqIss

I always liked the part when Tommy messes around with his big belly. :3 There is also an episode when Tommy gets a round belly from eating too much fast food.

An official page uploaded a version in better quality of the mpreg episode:
https://www.youtube.com/watch?v=_jz-cyUf5KM