Female Scientists Transforming and Fucking (Patreon)

You walk into the lab and see your two co-workers like this. One of them is insanely huge and muscular and has grown a penis along with a snout. She's fucking your other co-worker hard. You see a warning flashing on a monitor: "MUTAGEN CONTAINMENT BREACH - EQUIP GAS MASKS." Two gas masks lay tangled on the floor next to them.

You realize it's too late for you - you've breathed too much of the contaminated air. You feel yourself starting to change. Your co-workers beckon you, inviting you to make it a threesome.