Quick Japanese translation please? (hiragana)?

Hi :) I'm trying to translate a very simple something for a friend... My Japanese is extremely rusty... but so far between my memories and google, I've been able to figure most of what she asked my to translate out...

However, I finally got stumped. :( This one last line is all that's keeping me from hitting 'send' and it's really frustrating me.

I'm pretty sure I understand most of the sentence, but one of the words is eluding my efforts to translate....

Here it is, written in the exact way it's written on this manga page:

あんたはいいよ

のってるだけ

だもん!!!

(the last two lines were one character complaining about it being hot, and the other telling him to, basically, deal with it and stop complaining. This is the first character's return line.)

So.... any help? :)

thanks!