Plo Koon is in love with Wolffe, and Wolffe is in love with Plo Koon, but they can't go to bed together, that would kill Wolffe because most secretions of Kel Dor are toxic for human.
But that's ok, because Obi-Wan is not interested in a relationship, but ready to have sex: Plo Koon watch them, giving Obi-Wan's orders, and his Jedi friend obeys them, touch Wolffe like Plo would do, and let him feel it in the Force.
And Wolffe? Well, he can't have the thing he really wants, but it's almost good enough.