Oh my god, this got my head SPINNING and I am laughing at the thought of it!! LOL
Mutt would honestly freak out; But it isn't the fact he's got all of Regals responsibilities now, no. Is it because he feels he's shrank? Nah, he's more cuddly now... He's actually chest-size to many females, he loves it and would love to try it out if it wouldn't ruin his brothers reputation. Does question why his brother doesn't use his height to his advantage to be more seductive... But no!! It's the fact he has some secrets and he doesn't want his baby brother to know about just yet...
Regal?... Well, the height would be a bonus... Being tall has its quirks-- But the fact he feels ill without smoking, scents of sweets make him crave the subject at hand, and his lanky body is difficult to control at first? He actually hates it and he tries to find some source of familiarity by trying to get back into his old routines... But when his own body twitches for nothing yet something else entirely, well... He's finding it hard to control and realizes many things his brother is phased through daily.
The drowsiness, the sickness in his chest, his bones shake if he doesn't concentrate to still them... How certain foods will cease all his symptoms for a limited time. Regal never realized how hard his brother works to keep himself going daily. He ends up with new insight for his brother.
If it was for a limited time; Both brothers would end up closer together, finding new respect for the other they always looked down on. Regal always thought his brother was simply lazy; Not suffering silently. Mutt always thought his baby brother was too serious; But after seeing how harsh his own work force is; He sees why Regal has chosen to close up...