They're just as weird as you are.
Other people just don't get it. Sometimes you need to sing the commercial jingle you just heard, or talk about your nerdy hobbies in a judgement-free zone. Eric and Nell are past all of that.
While things definitely can get awkward, you won't find a better match than the two "meerkats" up in Ops, as Granger calls them.
Watch NCIS: Los Angeles on CBS.