To expand on my comment, and if you only need the moment the cream passes through the tip, an easy way to fake it would be to pass a cylinder through a lattice.

Start with a cylinder with a few edge loops and a subdivision modifier. Add a Lattice with an uneven number of U and V divisions and 3 W division. Scale the middle W to zero, then make the bottom of the lattice into a star shape matching the shape of you tip.
Add the lattice modifier to the cylinder and now, moving the it along the Z axis will deform it as if it'd been though the tip.

Now, this is obviously just a quick and simple way to fake it, and you might need to use more complicated softbody or fluids simulations if you want more realism. But I thought it was worth pointing out this technique.

To expand on my comment, and if you only need the moment the cream passes through the tip, an easy way to fake it would be to pass a cylinder through a lattice.

Start with a cylinder with a few edge loops and a subdivision modifier. Add a Lattice with an uneven number of U and V divisions and 3 W division. Scale the middle W to zero, then make the bottom of the lattice into a star shape matching the shape of you tip.
Add the lattice modifier to the cylinder and now, moving it along the Z axis will deform it as if it'd been through the tip.

Now, this is obviously just a quick and simple way to fake it, and you might need to use more complicated softbody or fluids simulations if you want more realism. But I thought it was worth pointing out this technique.