Blooooosshhhh-he ducked his head down, mumbling incoherently as he left-there was definitely a 'I will' somewhere in there but like-listen he's easily flustered by physical contact we KNOW this-
Like come on, ANY form of cuddling, EVEN THE SLIGHTEST smooch, AAAANYTHING, would make him 10x more embarrassed than Deku when he gets all might plushies from all might himself :)