The age of consent is 18 in TN but the girl is in luck because there's a close in age exception for someone not older than 4 years than the minor. So it's not statutory rape.
Generally, the mother gets custody in Tennessee. Unless there are some horrible, provable reasons that the mother is unfit to have custody. I have been through this very situation myself. Tennessee is a Mother's Rights state.
they would die
Nothing bad happens.
it gets pregnant and delivers mutant offspring.
It feels really good and there is a chance she gets pregnant.
they have a baby to a dirty old man...
If you're ovulating when that happens, you're going to get pregnant. If you're not there's a MUCH smaller chance of you getting pregnant. Almost 0%.
no
She gets wet.
The baby rips through the mothers belly
Not legally.
The girl gets pregnant and another idiot is born.