[Nova]

In my personal opinion, handjobs and fingering (since it's the female equivalent) are more serious than boob touch-age. They're just boobs. I like mine and I like when my boyfriend plays with them.

But I don't think you "owe" him anything when you were giving HIM a handjob to begin with. Certainly don't feel pressured to let him touch you if you're not okay with that. But how I see it is: your boobs are an erogenous zone that are less invasive if touched. I wouldn't go around letting everyone touch your hoo-ha. But I think you touching his genitalia is a bit more "serious" than him touching your boobs.

If you think you could warm up to the idea, maybe keep your shirt or bra on and let him touch you that way to get more comfortable.