As was mentioned by our lovely mods and members already, avoid to stroke the back/wings and anywhere else.
Conures are REAL snuggle monsters, even mine who still has trust issue with my hand, will snuggle up to the back of the hand, simply to imitate the feeling of snuggled up next to another bird (since the budgie will not let him near like that)
Keep snuggling little Nibbles, you can keep him in your hand, shroud him, keep him warm - just don't really pet and stroke anywhere but the head and the neck. Mine often would let me touch even under the wings, but for the sake of my sanity and not wanting to deal with his hormones, I refuse and just stick to the head and neck, the parts where he cannot groom himself.
If you see any signs of soon to be "bow-chicka-bow-wow", give him a little time out for 5-10 minutes. Don't punish! Just distract him or put on a playstand. If he wants to do the horizontal tango with a perch or a toy... let him be, he needs to let out steam somehow! I know I felt ashamed for my bird first time I saw it :'D