I headcanon Turtle as bi, but he prefers boys.  He had a small bit of time when he wasn't sure if he liked Kinkajou or Umber more, but that quickly dissolved when he found that Umber was really just a brother to him.

Turtle's dream date would be really anything as long as his date is happy and it's quiet.

As a parent, Turtle would make sure that his dragonet know how special they are.  His offspring would learn to depend on eachother but still be able to thrive by themselves.