Mandie looked down and noticed something "hey, what's with the bulge" she said pointing at you. You suddenly realize you do have a bulge and pull down your pants only to reveal a monsterous donkey cock. You realize that they were staring at you, desperate to get attention off of you you point out mandies bulge.
She pulls down her pants to reveal her own donkey cock. You become hard just looking at it, Sarah notices your hardon and absent mindedly begins to stroke your cock. You grab Sarah's hand from your cock to stop her. So she takes off her pants as if to taunt you, goes over to mandie, turns to you and presents herself to mandie.
Mandie immediately gets hard and starts to press up against Sarah and grinds her ass cheeks. This infuriates you, you walk over to Sarah grab her by the shirt and pull her up. You notice you can only pull her so close because your long hard shaft is in the way and she does too.
With a devilish smile she takes your cock in her hands turns around and puts it in her swollen pussy lips. Mandie takes this opportunity to sneak up behind you and shove her throbbing cock into your swollen moist womanhood. You gasp with shock and excitement as your vagina is being filled by mandie, once your friend, now your lover. You hear deep moans coming from in front of you. Sarah is having the time of her life.
Then you notice something at the base of her spine. A nub that quickly grows out into a tail. Neither Sarah nor mandie seem to notice. So you brush it off.
Then you notice hair sprout around your cock, the hair moves up your stomach into your shirt. You can't see the hair move up your shirt but you can feel it moving.
You feel your baseball sized balls clenching up and you know what is about to happen. Your pussy clenches the exact same time Sarah's does "FILL ME WITH YOUR CUM!!!" she yells. Mandie whispers in your ear " I'm gonna cum so hard that you will not be able to walk right for the rest of your life". That sends shivers down your spine. "AAAGGHHHH" you scream out in pain and pleasure as you get filled up. Without realizing you also fill up Sarah with your thick donkey sperm.
Once everyone is out of each other you all collapse on the bed. "Shit" you think to yourself "the hair". You take off your shirt and bra to see that you have thick hair that has crawled up to the base of your enlarged boobs.