Imagine Genji being really insecure about the size of his penis. Like it’s “below average” in size and he’s really embarrassed about it.
He is very hesitant to let you see it when the two of you get more intimate because he’s afraid you’ll laugh at him/be disappointed/break up with him about it.
It takes a lot of coercing to get him to strip for you. He even hides his face in embarrassment when you finally get a peek at his dick. He’s practically trembling, mentally preparing himself for the worst—
But you just smile, gently compliment him on the lovely penis he has and you go down on him so hard he’s practically forgotten what he was so nervous about.