- Whoops,
Tony gets splashed with truth serum. It leads to both admitting to wanting a little more than just friendship, and they try to act on those desires, but the Hulk is too much of an obstacle.
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... and then goes blind. They manage to act on those desires this time around, but Pepper proves to be an obstacle that wasn't big enough.
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So Bruce leaves. For half a year. Tony would be better without him, right? Except he isn't, and Bruce is called back to pull him from the edge.
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Things are surprisingly okay. Even when Tony gets them arrested for attempted prostitution. Because they love each other.
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Their success at being idiots in the lab continues, and now Tony's... pregnant.