It tends to be the modus-operandi of these stories to play mind-games, and I've seen it before where they, like Tea said, tell them to make babies, only for torture/food (yuyko and marisa comes to mind. since at first Yuyuko showed care for it, then proceeded to eat its young).
The anon like to troll his yukkuri but never says that he hated yukkuri. While the hybrid and its kin are not 100% safe, I think this ending is just further trolling the parents by allowing the hybrid what was denied to them.
The previous page was mistranslated--Anon told the hybrid NOT to make babies, and in this picture, we see she didn't obey. Presumably the whole thing is going to happen all over again (with the same dialog...).
But either way, it kinda works as a story.
"Bean Paste's End" should actually be something like "Bean-paste-for-brains: END."