How does your dual lighten your mood? What do they do/say that takes the edge off for you?
I, as an EII, am consistently and almost evenly melancholic. I'm a happy person by nature, but I'm a melancholic person. I have so much to deal with on a day to day basis; my father's depressed and I worry about him and try to help him, my sister's stressed, my mother has her own emotional issues, my friends (all of them) have at any one point have all this stuff that they can't deal with and get past; I am trying to deal with my own situation. With all this that does on in my daily nonstop circular ring of human interactions and relations, I see solitude in the haven of my dual's very focused psyche; "I do this now." So, I run over and in my scattered thoughts and emotions as my dual cousin puts on her show for us to watch and that's what we do then. I can get overwhelmed easily if outside things interrupt me; for example, my sister may send me bad news of the baby having an infection and I might not be able to emotionally ignore it or compartmentalize it because of how I'm connected and then my dual cousin will notice me in the corner somewhere, quiet, in my mind, not being attached to the things that are happening around me; we may be at a party or at a gathering and I'll just look within me; she'll come sit next to me (which is the distance I like when someone's being supportive of me) and will mention something odd or different, usually indirectly pointing at me "Yeah this inter net thing is really [something]." And, I won't have paid attention to the things she's actually said. She'll turn around to me after stating this odd comment and smile at me a wicked smile. This smiles speaks of "hey, I was really talking about you, but didn't want to mention it because I don't want to hurt your feelings, but get over it for now."
Or, she will, depending upon the situation or the level of my sadness, make a direct sort of comment that's made to lighten the mood, usually she'll follow this comment with a laugh.
My LSE friend will usually joke and say "I can beat him up for you." Or, "that's a like [laughing a wicked laugh]." They try to determine what's going on or what happened but when they make their judgement it's usually with a laughing at the end of it.