Closer to His Heart Than You Realized
There isn’t a love story in the MCU that left a deep impression on us as much as Tony and Pepper’s. To be fair, it had the longest amount of airtime to develop, starting from when Pepper was a gofer to finally becoming the CEO. The scene that describes their relationship the best takes place in Iron Man 3.
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During the epilogue scene, we see Tony going under the knife to extract a piece of shrapnel from his chest. In the next scene, Tony gives a custom-made necklace to Pepper, which was actually crafted from the piece of shrapnel that the doctors took out of his body.