Tube for fake cum

This idea just came to me and it's about combining fake cum with sex

I'd need a way to get a tube made from rubber safe to be put inside attached to the head so it would go inside her at the same time, i thought I'd use a rubber ring or something but it might slip off

On the other end of the tube I'd just have syringes full of fake cum that I'd use to pump it into her

I wouldn't try just pushing it into her since it might get stuck on something and wouldn't reach the bottom, plus that it would be turned sideways and might fall out due to the thrusting

Currently just an idea, nothing too serious