These are not shemales, for the record. They're a tribe of hermaphrodites, as should be self-evident since they've existed and reproduced without men for who knows how long.
@TheRealNiP: Considering "mpreg" exists as a thing on the internet, it's fully possible they're able to get pregnant without vaginas. Hell the last panel could be showing the man as cumflated or impregnated. It could go either way.
@errata: Sure, I enjoy mpreg and left it up to interpretation if the guy is pregnant or just full of cum at the end, but that was not meant to imply that these futa impregnate each other the same way.