Riley would be over the moon with joy probably if her could suddenly become happy with his body. I'd say waking up in the body of his dreams, but tbh, he's so depressed, he probably still wouldn't be satisfied. The only thing that would make him truly happy would be learning to love the body he's in. That said, he doesn't even really THINK getting the body he's trying to get will make him happy. TBH, there isn't much that he thinks would make him happy, not even going out with his crush.
He'd probably get happy for a little while if he could just have a day chilling, hanging out and teasing his older sister, but that's basically about it. Over the moon with joy isn't in the cards for him rn.
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