Well, in this fanfiction scenario, Gamora's assassin skills would be put to great use. She could be training Peter Quill, who has his own natural talents from his space - faring adventures. Ego might be a target of the assassins for some reason, perhaps because of his god - like powers. Peter and Gamora then have to protect Ego while also dealing with their own relationship issues and the challenges of the assassin underworld.
Peter Quill could initially be distrustful of Ego, given his past experiences. But Gamora, being more level - headed, might see the potential in Ego's power to help them against the assassins. So, she could try to convince Peter to work with Ego.
Their relationship would likely deepen. The impending arrival of a baby would bring them closer together on an emotional level. They'd have to communicate more about their hopes and fears for their family. For instance, they might have long talks about what kind of values they want to instill in their child.
Another plot could involve them preparing for the arrival of the baby. They could be seen shopping for baby supplies in different alien markets. Quill would be clueless about most things, while Gamora has a more practical approach, leading to some comical situations.
Gamora's fate varies in different comic arcs. Sometimes she meets her end, but her story often has complex twists and turns. In some cases, her death is part of a larger narrative development or a sacrifice for a greater cause.