She sees that drive to be helpful to them. Gamora knows she can't just accept it without clearing one last problem out of the way. "There is something else that may be holding her back as well."

Gamora forces herself to maintain eye contact while she calmly explains. She needs to catalogue every reaction to what she's saying for her sake and Tony's. Depending on what he does, her sister may just appear out of thin air to protect her.

"You didn't look surprised to hear I lived most of my life as a prisoner. I imagine you're smart enough to guess who our captor was, but I will tell you anyways. Thanos has a habit of eradicating races and taking one child from them to be his own afterward. Most don't survive the initial torture and modifications, but Nebula and I were among the few who did. He raised us as his daughters until the day he finally miscalculated enough to allow us to escape him. The things we did in his name before then are unspeakable. If you cannot handle what we did to survive, you should say so now. I promise you the Asgardians will waste no time informing you of every evil we committed especially if they need to distract you from how easily their prince bended to Thanos' will." She smiles ruefully. She already knows they'll do anything to protect one of their own even if he betrayed them gleefully.