thinking abt loop's star body but ~Horny~
hidden under all that almost burning-hot-to-touch star head, if you're brave enough to stick your hand or even crotch in their face, you'll find that they have a mouth with a tongue!!! and a whole human head!! you can even find and grip onto matted hair as you ride their secret human face when their star head flashbangs and sputters light
"stussy"/chest star is initially firm but slightly squishy to touch, becoming more sensitive as it's rubbed and can be pushed into by breaking through the protective layer (including ability to leak salty n sweet liquid that can become "overflowing" the closer to orgasm they are). it can also "dissolve"/weaken on its own when feeling aroused. otherwise it just ebb and flows warm light you can feel, almost like a heartbeat
default mode is basically barbie doll anatomy down there but has hidden holes that allow access the more aroused they are AND leak sweet tasting lubrication for as long as they're aroused
they're able to essentially body craft a penis organ on the spot for certain situations, be it human-based or otherwise. depending on their desires, they can cum as much as they want which can lead to fun things like excessive cum, stomach bulges, and etc (perfect for breeding roleplay with stardust or the fighter)! it doesn't really take as viable sperm, though, unless the Universe decides it will (but it usually doesn't)