well, respectfully, this sucks. there are many responses to this post describing pedestrian sexual fantasies wherein the slime girl is the one pleasuring you in rather pedestrian manners. it does not take a slime girl to do these things, it takes a girl who can do three things at once in this manner. this is not unusual.
um, to be clear, i do not mean to put you on blast, there are many even more pedestrian responses on this post, but many are hidden in the tags, and so yours is the most visible...
please consider that the intimacy need not be sexual. what if the slime girl could replace the vital matter of your body? what if she could run through your veins and arteries, carrying oxygen and nutrients in place of blood cells and plasma? you would never have to worry about viral, bacterial, or fungal infection again. you would never have to worry about diseases of the blood, of blood pressure, perhaps even of the heart. all in exchange for holding her close to your (metaphorical) heart, and eating a little extra to make sure she gets the nutrients she needs as well.
of course, there are other places. your brain, for example. drill a careful hole in your head and let her in. all of your grey matter, all of the pieces of you, untouched. instead, she chases down and digests every last glial cell, every ventricle, every myelin sheath. where once your mind was maintained by a legion of cells you cannot extend yourself into, it is now maintained by a girl who you care very deeply for, and she cares very deeply for you. she can do everything you need her to, and even tap your neurons, tap your mind, and speak to you directly. she can hug you without anyone seeing. she can catch you on the brink of panic and catch you before you fall down a terrible spiral. and, most importantly, you can do the same for her. relax your control of your own muscles, and she can control things for you. remember to invest in local cooperative games that can be played with a single hand, and play some nice games with her to pass the time. a few times in, she sabotages you, and eventually, you learn sabotage her back. the games are fair and sabotage-free after this. she cares very much for you, maintaining the very integrity of your mind, and so you must care for her as well. on the bad nights, where she lives in terror of the shadows of the past, you can hold her close and flood her with every soothing ideal your meager neurons can pump out.
and, of course, this is to say nothing of the ultimate fantasy, where she simply envelopes your body, and makes you into one of her. your skin is dissolved, your muscles are liberated, your bones are picked apart and put aside to form your own exterior slime cells... your heart, your kidneys, your lungs, all pointless organs to be discarded as she carefully turns it all over into a perfect, free-flowing slime of your own color. she floods your brain, as before, but now, crunches your mind, carefully and gently, and leaving, in its place, carefully crafted slime encoded with your mind, refreshed and liberated.
she could overwrite you in your entirety, you know. but she cares for you so much, and this is how you can chase even greater intimacies with her, far beyond the basal pleasures of genitalia and the like. will you trust her? will you place your entire existence into her hands, for her to safeguard? it will break her heart if you do not.