How would you go about a variant tiefling with wings, that cast disguise self. Would you make the wings become a cloak or part of your clothes? Do you think it's viable? For a warlock, would you recommnd wings or devils tounge? I'm tossed up betwee the two, and if disguise self wouldn't work with the wings I'd probably go for devils tounge. I want to run a warlock that's good at deceptiona and disguising himself, but am not sure if devils tounge is good. I feel like more could even be done with the base tiefling. Any thoughts? 

 Well the spell disguise self states...

You make yourself--including your clothing, armor, weapons, and other belongings on your person--look different until the spell ends or until you use your action to dismiss it. You can seem 1 foot shorter or taller and can appear thin, fat, or in between. You can't change your body type, so you must adopt a form that has the same basic arrangement of limbs. Otherwise, the extent of the illusion is up to you.
The changes wrought by this spell fail to hold up to physical inspection. For example, if you use this spell to add a hat to your outfit, objects pass through the hat, and anyone who touches it would feel nothing or would feel your head and hair. If you use this spell to appear thinner than you are, the hand of someone who reaches out to touch you would bump into you while it was seemingly still in midair.