I've never tried to switch, but I kind of like that idea lol give him a taste of his own medicine...literally!
I don't know if I could lick it off him...the squirting is inconvenient...because I would do better I think if it was just one big squirt rather than a bunch of little ones. But the main problem is the consistency...honestly the only way someone could get me to lick up cum would be to give me an extremely unpleasant alternative that I would desperately want to avoid. I'm going to definitely try the cornstarch/water and the syringe idea is a good one too.
I'll let you guys know how the experiment goes...I may warm it up a little too, just so it's as close to cum as possible.