it depends on how light he's peeling this flop
at 100NL vs. some regs I'd bet because a lot of people will still call the flop with 99-JJ, KQ type of hands with the intention of showing their hand down

of course what you have against you is that he's UTG so your raise gets more credit so he might dump KQ/QJ type hands pre and 99-JJ on the flop
also NL25 is not as aggressive pre so he might be flatting hands like AK instead of 4b/get it in

so c/f is not unreasonable at all