Mimic slime?

The slime leaped this time, leaping onto Akari's left arm, her tunic silently melting as her arm was engulfed in the slime.

Akari flailed her arm in vain, trying to swat the slime away.

Akari: Damn, someone help me.

Luli decided to try again with the dagger, this time; she just had to keep moving so the vines wouldn't catch her.

Saving throw failed

Or maybe not, Luli found the vines binding her legs as soon as she stepped inside, preventing her from getting any closer.

Angela: How long does the Sylnohir spell last?

Sylnohir:...

Angela: Sylnohir?

Sylnohir: I can cancel it, it'll disappear in a few seconds.

Sylnohir looked less than happy.

Angela: Luli, Akari, hold on, the spell will deactivate soon and then I'll strike the slime with divine punishment!

Akari: It's eating my arm!

The slime devours the clothes on her arm and she's getting closer for Akari's face.

Akari: Oh no.

Strength saving throw, Akari passes, Luli fails.

Akari manages to tear away the vines blocking her legs and runs towards Luli.

Akari: Stab him, stab him!

Luli tries, but trying not to hit Akari in the process, ends up missing.

Sylnohir: She approaches, staying out of the way of her spell's vines, which soon dry up and crumble to dust.

The slime detaches itself from Akari and jumps onto Luli's legs, crawling into her clothes as it melts them.

Luli: I'm sorry, but I'm not interested.

Luli grabs the slime and throws it at Angela.

Luli: Angela, hit her now!

Angela doesn't need to be told twice; a blast of holy energy hits the slime, this time burning part of it.

The slime, however, isn't destroyed, but deflected into Sylnohir's face.

Sylnohir tries to swallow the slime by sucking it, but the slime escapes by jumping off her.

Sylnohir: It tastes like strawberries.

Akari: We have to finish this! Go, spiritual weapon!

A hammer appears in the air and moves towards the slime.

But at that moment, something happens. The slime begins to change, stretching and twisting, taking on a humanoid shape: Akari's arms, and chest, Luli's legs and ass, and Sylnohir's face and (unrelated) hair.

https://it.pinterest.com/pin/83035186875143182/

but all in one combination that screamed young woman of about 18 years old

Akari stops, confused, at the sight of the now naked slime woman that formed from the original little slime.

Angela: God, she's sexy.

Akari: I still have to hit her, right?

Sylnohir: Is that hitting her pretty face? I'd be offended.

Luli: So what do you want to do? It's not like we can put her in a bottle and take her with us; she's too big.

Angela: We'll find a barrel.

Luli: That wasn't the point!

Slime: Sex!

Akari: She can talk!

Sylnohir: Yes, sex! I volunteer!