Your mind's first break through the haze of lizard lesbian sex with Andrea is a warm feeling around your reptilian cloaca, different from the need for stimulation the two of you were satisfying with one another -- rather, it felt rather painful, like something inside you was twisting. Your lustful moans were mixed with painful groans as your rhythmic pulses seemed to push whatever it was you felt inside you out bit by bit, until you felt a new sensation from your groin...the sensation of a small, throbbing rod emerging from where your cloaca was. You could feel the twisting before you look down at it, your rational part realizing that what you had coming out had into a reptilian penis, nearly as big as one of the dicks you had seen on other lizardmen.
Although you could still feel the need to continue copulating with Andrea, your shocked surprise won out for the moment as you pulled your lower half away from your mate. You let out a growl of confusion as you cautiously touched the end of it, which sent a wave of pleasure through your body that told you yes, you're not imagining it; around the base of where the strange appendage was coming out of you you could see the outline of your cloaca, now stretched open like you were trying to lay the penis like an egg. You felt something well up inside you, coursing through your new penis before squirting out of its end a small bit of what your nose realizes was male seed.
Your other claw reached up and brushed your D-sized breast, the sensitive nipples sending another wave of pleasure through your body that made you release another lustful growl. That was confusing, among other things -- there was plenty of video evidence that humans who had been infected by the feral lizardpeople could change sexes, but no cases of anyone having both male and female parts at the same time. Curious, you use a claw to push down on your new member, doing your best to ignore the sensitivity trying to break your concentration until you see your reptilian member gradually recede back into your body. Your cloaca now looks like how it was before, except it seemed to be more puffy and darker from blood flow and you could still feel that strange rod within your body, just behind the veil. You prepare yourself mentally and let your changed lizard body go, your member re-emerging slowly until it's back to its previous size.
A lizard groan from Andrea drew your attention to your mate, whom you realize had made the same discovery on her (his? their?) body; the malehood coming from Andrea emerging and retreating in and out of the rest of the lizard body showing that. Andrea's eyes showed confusion and surprise by this turn of events, though the low lustful growl that escaped Andrea's maw suggested this might not be done.
You do find, at least, that hormones aside your rational human mind was still intact -- hopefully the same would be true for Andrea.