Sunfire Melt Ganyu = free dopamine :D!
You'll want Ganyu's burst for this one, so no Shimenawa's 4piece! Traditional melt Ganyu wants to ignore her burst because it eats up the pyro aura, making Ganyu's charged shot not to melt. However, Sunfire (Jean's ult inside Bennys ult) applies strong pyro on enemies, and at fast intervals, making you able to melt even using her burst! which means +20% cryo dmg bonus as one of the buffs. Also, Ganyus burst enables Jean to swirl for VV bonuses, and Benny to proc a reaction (he is using Instructor 4 piece, one of my faves).