The only word to describe that is succulent , but it doesn't mean it melts in your mouth though . >A succulent cake that melts in your mouth when you have a bite.

This cake melts in your mouth like ice cream; it's so light and fluffy!

"This cake is so gooey and delicious. The flavor is heavenly. The texture is smooth and creamy." Hope this helps.

Wow it is delicious, sticky, soft and amazing , I am in heaven , it is yummy and great