So I found an image set, and doing manips on the eyes are easy enough, but I need an idea for what's controlling them. If you've got any images I could throw in along those lines, that'd be appreciated but I would like some ideas too.

imgur.com/a/4SZkC

How about a trap? They're caught in a trap where they lose control of their bodies and minds. The person that lay the trap has them do whatever he pleases, including sex.

Just an idea though.

My idea would be a curse or (rogue, old) magic took hold of them and now they're fucking everyone in their vicinity to sate their magical lust. Perhaps as a tactic to incapacitate fairy tail, or a backfired prank... I like the prank idea better, personally :)

Or maybe Erza and Mirajane went out on an S-Class job to break up a sex trafficking ring, and it turns out the leader can use some sort of advanced version of Charm or mind control magic.

Wouldn't be the first time...

Since I think we need more of the hypnotic_penis tag they're hypnotized by the guy's dick.

I think I'll combine these two ideas. Thanks for the responses!

Your welcome

I approve! Hope to find it on the hub soon :D (I try to check the forum before the posts so if you've already posted it I'm sure Im in for a treat ;P)

Glad you liked it :)