Hah. Both.

Ashley nods and moves closer, standing in front of you and bowing down. Instead of taking your shaft into her mouth, she just gingerly licks it. Meanwhile, her hands are busy to strip out of her pantyhose and panties. She moistens up your dick-tongue with some more superficial licks, but she's more concerned with placing her clothes on a chair. She begins to button off her tight top, but then reconsiders. Only naked from the waist down, she now critically measures up your ersatz-penis.

Casey taunts her for being slow, but she has also begun shedding her panties. She sits naked behind you on your bed, and proceeds to steal your bra from under your flimsy pajama-shirt. And then she surprises you with another quick move: Using the bra, she binds your wrists together, behind your back. You can only wheeze as a response, your protest shout turns out to be a muffled and really **** "nnnnnn". It makes both of your partners laugh.

Then Casey begins to properly tease your titties, fondling you from behind while rubbing her own titties on your back. This really turns your mood around again. Ashley's hesitation and Casey's rude bondage had dampened your mood, but Casey's new ministrations make your tongue vibrating again. It's exhilarating, and Ashley seems positively mesmerized. Instead of continue to lick you, she reaches into her handbag and gets lube. It is a mint-fragrance, of all things, and you don't just smell it... you can taste the cooling flavor as she rubs it on your... tongue. You still have some tastebuds on it, although most other tongue-tissue got swapped out against the penis' tissue and muscles. So yeah, you got a lubed tongue now, and it's hard as fuck.

In this reality, it is not the first time that you assisted Casey in sex, but your memories of that are exceptionally hazy. You have no idea what the bitch is planning...

Your two fellow students then arrange a new position: Ashley lies down on her back, while Casey guides you into a crouched position that allows you a direct view on her artfully trimmed bush. And then Casey gets comfortable on top of Ashley, allowing you a direct view of her face as they do a 69. Wow! Right in front of your frustrated nose (and your 'tick'), Casey hogs Ashley for at least five minutes, but their girl-on-girl-action is just hot, and Casey's orders make no secret out of the fact that you're only parked in your close observer position until their entrances are ready.

And then you are ordered in. Maybe you hate that Casey calls it your 'tick', and how you ended up with it, but it's a pretty great sex tool and the girls make some great use of it. You shift forward until you're positioned reasonably well, and then you ram your hard cocktongue into Ashley's moist pussy, first with Casey directing you to Ashley's optimal spot. As you begin to rhythmically move your neck back and forth, Casey reaches her hands out to fondle your breasts again, which makes you feel weirdly gooey in the belly, but which also hardens your tongue further.

Ashley's cunt is a heavenly place, and you suddenly find yourself slurping something in as if your cock was an elephant's trunk. It's a salty, slimy liquid, flavored with minty lube. At first you are revulsed, but as more and more of it flows into your cock, you eagerly take it in. You just discovered that most of your tastebuds are now inside your tongue, and it explodes with flavor!

Hm, it only makes sense - Casey had said that you couldn't cum. Now you know what it means to have no balls.

After more than ten minutes, you are ready to complain that nobody takes care of your own aching, flaming pussy, as your hands are still bound behind your back but Casey just laughs and shakes her head when you point at yourself. Instead, she and Ashley are switching positions, and your vibrator-cocktongue now gets to explore your bitch roommate's cunt. You quickly learn that Ashley is an amateur: Casey outright massages your penis, she is also a lot better in teasing your skin with her fingers during sex, and she also tastes a lot better. Sure, she is also salty, tangy and clammy, but you get hints of umami as well. How the fuck did Casey season herself with meat-flavor?