Kissing with braces? ?

That's odd, I use to have braces and hot make out sessions before too. It's probable you both are using too much pressure too. The braces are on your teeth not your tongue, next time when the sores start coming in...just pull back a bit...and talk or tell him...kinda like taking a break. Kissing takes 2 people so you both need to find something that's comfortable for the two of you.