I think its a common thing for first timers to tickle too hard. You can tell him to read this:
https://www.literotica.com/s/the-ler-guide
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I actually just confessed it to my wife of 5 years (literally like a week ago) and it's been awesome. She already sort of knew but I always downplayed how into it I was and never really explored it with her because I was scared and thought she wouldn't be into it.
We were laying in bed talking...