I roughly translated to
"Having the swimsuit stuck so close, there's no way you don't have a reaction"
What does いられるかっ mean in this sentence? Any ideas?
I imagine the speaker is a man. He's saying "I can't stay clam/cool if she (who is in swimsuit) gets so close to me."
無反応でいられるかっ means "how can I stay cool?"
いられる is the potential form of いる (to be/to exist) and か is the question marker.
So the _____ + いられるか portion means, "how can I be ______".