There are two more hookup/hookup-adjacent endings aside from those. For the first, do the same steps you did to get to #1, but turn down Marco's proposition. When you're given the option to jack off after that, do so, but don't go to Marco's bed (that will just segue into the sex scene). Instead JO together in your own beds. You can reach this same ending via #3 if you turn down his proposition while jacking off together.
For the second, do the same steps leading to #3, but take your shirt off instead of going home. It can lead to two versions of a hookup scene with one of the guys there.