i like messing around with mortis' design/story. so. au where he's just a decepticon who kind of fucked off after his trinemates died. he was on earth for a long time, and only left for energon/fuel. he's a very lonely mech so when he sees another bot he gets a little excited
those cables can be used for all sorts of fun things... bondage and self servicing for one...
his wings and finnials wiggle when he gets close, and his vents start to steam/smoke up when aroused. his cockpit lights pulse when aroused as well.
also, his array has a knotting mod for shits and giggles. it's mesh that expands when activated. the size is nothing to write home about (by warframe standards) but he prefers smaller frames sooooo.... oh and his valve has like... gel packs inside. like those ice packs that have squishy gel? or like. if you put a ton of aloe vera in a thick plastic. heated of course. so very soft.