For ENFJs their first function is Extraverted Feeling. ENFjs are wired to notice how everyone is getting along and jump in to smooth out what they imagine as a lack of harmony between people--emphasis on imagine. ENFJSs are nice to have sprinkled around your life. We're naturally fun.
We like making people around us comfortable, but can take on way too much responsibility for the feelings of others.
For INTPs, Extraverted Feeling is their 4th function, a grip spot.
Extraverted Feeling for INTPs is less conscious and reliable. So INTPS might like to have the ENFJ take over some of the emotional part of their personality. Is that a good idea for either?