...not really. Imouto reminded me of an ex who pulled the same crap when she didnt get her way. I know I shouldn't project onto fiction, but god damn was it a lot.
The only outcome of onii-chan's 4 month shut-in anguish, is that he's become an open two-timer who got back together with his ex, maybe mere hours after sowing his seed in his little sister. His lack of eyes betray his true hentai protagonist nature...