The proper thing to do is coat that beaver butter in your precum, like you did, then pull them on over your head with the crotch over your mouth, and your nose where her clit would be, lay on the bed with your favorite toy on your cock. Then sniff and lick until the panties are completely clean. You should be sucking on them by the time you cum. Relax for a minute then lay the panties out to dry. Fold them and put them in her panty drawer.